Free IAT mock tests and previous year paper practice, open to everyone: start with the full-length 240-mark IAT mock or the searchable question bank — no sign-in needed — then go deeper with chapter-wise IISER IAT study material for Physics, Chemistry, Mathematics and Biology, a 30-question practice test for every chapter with instant scores and answer review, the exam pattern explained, and a 12-week study plan. Register free in under a minute to unlock every chapter test and track your scores.
Build your plan across Physics, Chemistry, Mathematics and Biology with chapter-wise IAT revision notes, previous-year-style practice and free 30-question chapter tests with per-question answer review. Use each result to identify weak concepts, revise them, and test again before moving to mixed practice.
For 2027 and 2028 aspirants, this four-subject preparation structure is a practical starting point while official year-specific notices are awaited. Always confirm the final syllabus, eligibility rules, dates and paper instructions on the official IISER admissions website.
Based on recent official IAT notices, the paper is a computer-based test of 60 multiple-choice questions — 15 each from Physics, Chemistry, Mathematics and Biology — to be solved in 180 minutes. Each correct answer earns +4 marks and each wrong answer carries a −1 penalty, so accuracy matters as much as speed. The syllabus is broadly the NCERT Class 11–12 curriculum across all four subjects.
Pattern and marking are based on recent official notices and can change; confirm the current year's instructions on the official IISER admissions website before the exam.
IISER does not publish an official chapter-wise weightage for the IAT. The picture below is compiled from publicly reported past papers and candidate analyses, and it should guide your revision order — not replace full syllabus coverage, since any NCERT Class 11–12 topic can be asked.
Search the IAT question bank by subject, chapter, topic and year →
Turn weightage into marks: start with the high-weight chapters below, finish each chapter's free notes, then clear its 30-question test before moving on. Your test scores show exactly which high-weight chapters still need work.
The IAT question paper typically carries 60 multiple-choice questions — 15 each from Physics, Chemistry, Mathematics and Biology — broadly aligned with the NCERT Class 11–12 syllabus. Official past papers are published through the official IISER admissions website; always download them from there. To turn PYQs into marks, practise the same chapters here: every chapter below includes free notes, a PYQ-style analysis of how the topic is asked, and a 30-question mock test in the IAT format with instant scores and per-question answer review.
The free Prepkunj IAT diagnostic checks your current level across Physics, Chemistry, Mathematics and Biology and reports subject-wise scores with the chapters to fix first. Use the result to order your revision: weak chapters first, strong chapters as maintenance.
Revise all four IAT subjects rather than treating one as optional. Start with the subject filters below, read the chapter notes, review formulas and common mistakes, then mark completed chapters as you progress. The chapter list covers Physics, Chemistry, Mathematics and Biology in one place.
Use each free 30-question chapter test as a focused IAT mock test after revising its notes. Check your score and question-level result, revisit weak concepts, and retake the chapter before attempting broader mixed practice. Select “Tests available” below to find test-ready chapters quickly.
The IISER Aptitude Test asks 60 multiple-choice questions — 15 each from Physics, Chemistry, Mathematics and Biology — so every subject carries an equal 25% weightage. Skipping a subject you did not take in Class 11–12 means giving up a full quarter of the paper. Questions are broadly at the NCERT Class 11–12 level, with some concept-application items comparable to JEE Main difficulty.
| Subject | Questions | Weightage | Typical difficulty |
|---|---|---|---|
| Physics | 15 | 25% | Concept + numerical, close to JEE Main level in mechanics and electromagnetism |
| Chemistry | 15 | 25% | Mostly NCERT-direct; physical chemistry needs numerical practice |
| Mathematics | 15 | 25% | Class 11–12 level; calculus, algebra and probability dominate |
| Biology | 15 | 25% | NCERT-fact based; genetics, physiology and ecology are frequent areas |
Marking scheme and pattern are based on recent official IAT notices; always confirm the current year's instructions on the official IISER admissions website before the exam.
Mechanics, electromagnetism and optics carry the most IAT physics questions, at roughly JEE Main conceptual level. Use the Physics filter below to read each chapter's notes and common mistakes, then take its free 30-question test with instant scores.
IAT chemistry stays close to NCERT: organic reaction mechanisms, physical chemistry numericals and fact-based inorganic questions. The chapter notes below highlight how each topic is asked, and every chapter test reviews your answers question by question.
Biology is a full quarter of the IAT, so PCM students cannot skip it. Genetics, physiology and ecology recur most; start NCERT Class 11 biology early and use the chapter tests to check retention before moving to mixed practice.
Biology is the subject most IAT aspirants under-prepare, especially students from a PCM background — yet it carries the same 15 questions and 60 marks as every other subject. The free IAT biology notes on this page follow the NCERT Class 11–12 sequence, so you can study them alongside school or rebuild the subject from zero.
After each chapter's notes, take its free 30-question biology test below — the per-question answer review shows exactly which facts and concepts did not stick. Select the Biology subject filter to see every biology chapter in one list.
IAT is a research-aptitude paper, not a rank race. Questions reward understanding over formula recall: a mechanics problem may hide a graph-reading step, and a biology item may ask you to interpret an experiment rather than remember a fact. Prepare by solving with reasoning written out, and read each chapter's "common mistakes" notes before its test.
Class 12 science students (any stream combination — PCM, PCB or PCMB) aiming for the BS-MS and other research programmes at the IISERs. Because all four subjects carry equal marks, PCB students must rebuild maths basics and PCM students must cover NCERT biology — the subject filters below make that gap visible.
The IISER Aptitude Test favours questions that read like small research problems: data from an experiment, a graph to interpret, or a familiar concept used in an unfamiliar setting. Build that skill deliberately with the chapter tests above.
These are practice examples written in the style seen in past IISER Aptitude Test papers, not reproduced questions. Always cross-check the pattern and syllabus with the official IISER admissions notice at iiseradmission.in.
Past IAT papers are the cheapest guide to what the IISER admission committee actually asks. Work through them in three passes rather than one: an untimed pass to learn the question styles, a timed pass to build a subject order, and an error pass where every wrong answer is traced back to the chapter notes above. Question papers and answer keys for previous cycles are published on the official IISER admissions website at iiseradmission.in.
Detailed walk-throughs: IAT PYQ strategy, IAT mock test strategy, IAT preparation strategy and the complete IAT 2027 guide.
IAT is the admission route to the BS-MS (dual degree) programmes at the IISERs, and to select programmes at institutes such as IIT Madras and IISc that have used IAT scores in recent cycles. Eligibility and application rules — including which boards and marks qualify, seat counts and important dates — change from year to year, so always read the current year's official notice at iiseradmission.in before applying.
Want the full picture? Read our complete IISER IAT guide for the exam pattern, syllabus and a 12-week plan, or start practising with the free IAT exam pattern and IAT syllabus explainers.
Finish the loop with a full-length 240-mark IAT mock test (60 questions, 4 subjects, 180 minutes) every fourth Saturday and in the final two weeks. A second mock with a fresh question set is ready for your next attempt.
Finish Class 11 chapters in your two strongest subjects; test each chapter as you complete it.
Start your two weaker subjects from NCERT basics; keep one revision test per week on earlier chapters.
Cover Class 12 chapters and begin cross-subject mixed practice with timed 30-question sets.
Retake your lowest-scoring chapter tests and review only the questions you got wrong.
Aim for roughly 12–15 focused hours a week alongside school. Rotate all four subjects so none is skipped for more than two days, and reserve one longer block for timed testing.
| Day | Focus block (1–1.5 h) | Second block (1 h) |
|---|---|---|
| Monday | Physics — read the chapter notes, note formulas | Mathematics — solved examples from the same topic area |
| Tuesday | Chemistry — notes plus reaction or concept drilling | Biology — NCERT reading with diagram practice |
| Wednesday | Mathematics — problem sets on the week's chapter | Physics — numericals and dimensional checks |
| Thursday | Biology — notes plus terminology revision | Chemistry — equations, trends and named reactions |
| Friday | Weakest subject — extra hour from your own gap list | Flash-card revision of the week's formulas and facts |
| Saturday | Timed chapter test (30 questions) for each chapter finished this week, then full answer review — this is your mini mock test slot | |
| Sunday | Rest or light revision only; retake one low-scoring chapter test and update next week's plan | |
Adjust the blocks to your school timetable — the fixed points are daily contact with all four subjects across the week and one timed, fully reviewed test session.
Read these before you build your schedule — they cover the syllabus, the paper and a month-by-month plan.
IAT classes are online, so where you live changes your schedule rather than your syllabus. These notes come from the practical constraints aspirants report in each city — school timings, board pattern and which of the four subjects usually gets left behind.
Most Lucknow students prepare for IAT alongside NEET or JEE school batches, so biology or maths ends up neglected. Block two fixed evening slots each week for the subject your stream skipped, and use the chapter tests to check it is really moving.
Kota schedules are built around JEE and NEET. IAT aspirants there should protect Sunday mornings for the fourth subject and use IAT-style reasoning questions rather than only high-difficulty JEE problem sets.
With school, board practicals and travel time competing, Delhi NCR students do better with shorter daily sessions plus one long weekend block. Keep the NCERT text as the primary source and reserve reference books for weak chapters.
Hyderabad's intensive junior-college timetables leave little free time, so IAT prep works best as chapter tests taken on completed college chapters — you revise and test without adding a parallel syllabus.
Pune students often target IISER Pune specifically. Prepare for the whole four-subject paper rather than just the campus, and confirm each year's eligibility and seat rules on the official IISER admissions site.
Kolkata board students usually have strong theory but less MCQ speed. Convert written practice into timed 30-question sets early so the computer-based format is not new in the exam hall.
Long commutes are the main obstacle. Use travel time for definitions, formula sheets and biology recall on the phone, and keep numerical practice for desk sessions at home.
Bengaluru PU students often have a strong maths base but thin biology coverage. Start NCERT biology from Class 11 first — genetics, physiology and ecology recur most in IAT-style papers.
State-board students in Chennai should map their syllabus against NCERT before starting, then use the chapter list here to fill topics the state textbook covers lightly.
With an IISER campus in the city, local aspirants tend to start early — use that time to finish Class 11 across all four subjects before Class 12 begins, then keep revising with weekly tests.
Access to IAT-specific guidance is limited locally, so lean on free chapter notes and per-question test review. Online one-on-one doubt sessions are usually a better spend than another reference book.
NRI students should plan around exam-centre availability and travel dates, and confirm the centre list and eligibility for their year on the official IISER admissions site well before applying.
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Ask for a free IAT planning call if you are unsure how to balance the fourth subject with school, or which chapters to start with. Classes are online for students anywhere in India and abroad; the Lucknow office handles admissions, fee queries and in-person counselling by appointment.
Everything on this page is free to use, and it is built around one loop: revise a chapter, test it, fix what the result exposes, then move on.
Physics, Chemistry, Mathematics and Biology chapters sit in the same filterable list below, so you can keep equal weight on each subject instead of drifting into your strongest one.
Each chapter test is 30 questions with a question-level review afterwards, so you can see which concepts cost you marks rather than only a total score. Filter by “Tests available” to find them.
Sign in to mark chapters complete and get suggested next chapters based on your recent test results, so revision order follows your weak areas.
If you need taught classes, doubt-solving and recordings, our IISER IAT course runs as affordable group batches or one-on-one sessions.
Select your class / paper and subject to see only the notes and chapter tests you need.
Filters: all class / papers, all subjects. 46 chapters shown
Units, dimensional analysis and error estimation underpin every numerical in physics. IAT frequently tests dimensional consistency checks, significant figures and propagation of errors as quick, formula-independent questions.
14 min read · Weightage 4–6% of IAT Physics
Kinematics describes motion using position, velocity and acceleration, while Newton's laws explain the causes of motion through force and momentum. IAT frequently combines graphical motion analysis with free-body-diagram numericals involving friction and connected bodies.
17 min read · Weightage 8–10% of IAT Physics
Work-energy theorem, conservation of mechanical energy and momentum conservation in collisions form a tightly connected problem-solving toolkit. IAT often tests elastic/inelastic collision numericals and spring/pendulum energy conservation together.
16 min read · Weightage 7–9% of IAT Physics
Rigid-body rotation extends Newton's laws to torque and angular momentum, while gravitation connects orbital mechanics to Kepler's laws. IAT often pairs moment-of-inertia calculations with satellite-orbit and escape-velocity numericals.
17 min read · Weightage 7–9% of IAT Physics
Elasticity, surface tension, viscosity and fluid statics/dynamics link microscopic intermolecular forces to macroscopic mechanical behaviour. IAT tests stress-strain curve reading, Bernoulli applications and terminal-velocity numericals with equal weight.
16 min read · Weightage 6–8% of IAT Physics
Kinetic theory of gases, thermodynamic processes and heat engines connect molecular motion to macroscopic work and heat. IAT frequently combines PV-diagram interpretation with first-law and efficiency calculations in a single multi-step question.
16 min read · Weightage 6–8% of IAT Physics
Simple harmonic motion, damped/forced oscillations and mechanical waves form a heavily tested IAT block, with frequent numericals mixing energy conservation, phase relations and standing-wave harmonics.
17 min read · Weightage 8–10% of IAT Physics
Coulomb's law, electric field/potential and capacitor networks are foundational for IAT Physics, with combined problems on energy stored, dielectrics and series-parallel capacitor grids appearing regularly.
17 min read · Weightage 8–10% of IAT Physics
Circuit analysis (Kirchhoff's laws, resistor networks, meters) and magnetic effects of current (Biot-Savart, Ampere's law, EMI) are core IAT topics, often testing multi-step circuit reduction alongside conceptual magnetism.
18 min read · Weightage 10–12% of IAT Physics
Electromagnetic induction, alternating current circuits and Maxwell's unification into electromagnetic waves form a tightly connected block. IAT problems commonly chain a motional-emf or mutual-inductance setup into an LCR resonance or power calculation.
17 min read · Weightage 7–9% of IAT Physics
Reflection, refraction, lens/mirror formulas and wave phenomena like interference and diffraction are consistently tested in IAT, mixing sign-convention numericals with conceptual questions on Young's double slit and diffraction limits.
17 min read · Weightage 8–10% of IAT Physics
Photoelectric effect, atomic/nuclear models and basic semiconductor devices bridge classical and quantum ideas, and are a favourite IAT source for conceptual plus numerical questions on energy quantisation and diode/transistor behaviour.
17 min read · Weightage 8–10% of IAT Physics
The mole concept, laws of chemical combination, stoichiometric calculations and concentration terms form the quantitative foundation of all chemistry. IAT numericals routinely combine limiting reagent, percentage yield and concentration conversions in a single multi-step question.
14 min read · Weightage 5–7 questions in IAT Chemistry
Quantum mechanical description of the atom explains electronic configuration, which in turn governs periodic trends in atomic size, ionisation enthalpy, electron gain enthalpy and electronegativity. IAT frequently pairs quantum-number/configuration questions with trend-comparison conceptual questions.
16 min read · Weightage 6–8 questions in IAT Chemistry
Chemical bonding explains how atoms combine via ionic, covalent and metallic interactions, with VSEPR, hybridisation and molecular orbital theory rationalising shape, polarity and magnetic behaviour. IAT frequently tests shape prediction, bond order calculation and comparison of bonding/hybridisation across similar molecules.
17 min read · Weightage 7–9 questions in IAT Chemistry
Chemical thermodynamics quantifies heat, work, internal energy and spontaneity using the first and second laws, while thermochemistry applies Hess's law and enthalpy data to reaction energetics. IAT numericals commonly combine state-function calculations (ΔU, ΔH, ΔS, ΔG) with Hess's law and Gibbs free energy spontaneity criteria.
15 min read · Weightage 6–8 questions in IAT Chemistry
Chemical equilibrium (Kc, Kp, Le Chatelier's principle) and ionic equilibrium (acids, bases, buffers, salt hydrolysis, solubility product) together form one of the most numerically dense IAT Chemistry areas, testing both conceptual reasoning and calculation speed.
17 min read · Weightage 8–10 questions in IAT Chemistry
Redox reactions, electrochemical cells (galvanic and electrolytic), conductance and chemical kinetics form a tightly linked, calculation-heavy IAT block covering oxidation number rules, the Nernst equation, Faraday's laws and rate law derivations.
17 min read · Weightage 8–10 questions in IAT Chemistry
Colligative properties link solute amount to measurable changes in vapour pressure, boiling point, freezing point and osmotic pressure, while surface chemistry covers adsorption, colloids and catalysis. IAT tests both quantitative colligative calculations (with van't Hoff factor corrections) and conceptual surface-chemistry classification.
13 min read · Weightage 6–8 questions in IAT Chemistry
Periodic trends across s-, p-, d- and f-block elements — anomalous first-member behaviour, inert pair effect, transition metal properties, and lanthanoid/actinoid contraction — are recurring conceptual and comparative themes tested across the IAT Chemistry section.
16 min read · Weightage 7–9 questions in IAT Chemistry
Coordination compounds feature a central metal bonded to ligands via coordinate bonds, exhibiting rich structural (isomerism), electronic (colour, magnetism) and bonding (VBT, CFT) behaviour. IAT tests IUPAC nomenclature, isomerism classification, crystal field splitting and magnetic/spectral predictions.
14 min read · Weightage 6–8 questions in IAT Chemistry
Hybridization, isomerism, electronic effects and reaction intermediates form the conceptual backbone of organic chemistry, and IAT questions in this area typically test the ability to link structure to reactivity and stability rather than rote memorisation.
16 min read · Weightage 8–10 questions in IAT Chemistry
Alcohols, phenols, ethers, aldehydes, ketones, carboxylic acids and amines each show characteristic reactivity governed by their functional group. IAT emphasises named reactions, acidity/basicity ordering, mechanism-based product prediction and distinguishing chemical tests.
14 min read · Weightage 6–8 questions in IAT Chemistry
Biomolecules (carbohydrates, proteins, nucleic acids, vitamins, hormones) sustain life processes, polymers are giant molecules built from repeating monomer units used across industries, and environmental chemistry studies pollution of air, water and soil along with green chemistry principles. IAT tests structural classification, biochemical reactions, polymer types/uses and pollution mechanisms.
14 min read · Weightage 6–8 questions in IAT Chemistry
Biological classification systematises the enormous diversity of life using nomenclature rules, hierarchical taxonomic categories, and the five kingdom system, extending to viruses, viroids and lichens. IAT questions probe precise classification criteria and characteristic features of each group rather than memorised lists alone.
14 min read · Weightage 4–6 questions in IAT Biology
The cell is the fundamental structural and functional unit of life, with prokaryotic and eukaryotic organisation, membrane-bound organelles and division machinery. IAT tests precise organelle function, membrane transport mechanisms and comparative cell biology.
16 min read · Weightage 6–8 questions in IAT Biology
Plant physiology covers transport of water and nutrients, photosynthesis, respiration, plant hormones and photoperiodism/vernalisation. IAT expects quantitative and mechanistic understanding — light and dark reactions, C3/C4 comparison, hormone actions, and water potential concepts.
16 min read · Weightage 5–7 questions in IAT Biology
Human physiology integrates digestion, breathing, circulation, excretion and neuro-endocrine control into one coordinated system. IAT tests precise mechanisms — enzyme sites, pressure-volume changes in the cardiac cycle, nephron transport, and hormone feedback loops — rather than rote listing.
16 min read · Weightage 6–8 questions in IAT Biology
This chapter covers plant and animal tissue systems, morphology of flowering plants, and the anatomy of a representative animal (frog/cockroach type questions). IAT focuses on precise tissue identification, floral formula interpretation, and structural-functional correlation.
15 min read · Weightage 4–6 questions in IAT Biology
Reproduction spans sexual reproduction in flowering plants (pollination, fertilisation, seed/fruit development), and human reproduction including gametogenesis, menstrual cycle, fertilisation, and reproductive health. IAT tests precise sequences and structural details over rote memorisation.
16 min read · Weightage 5–7 questions in IAT Biology
From Mendel's laws through molecular inheritance to the mechanisms of evolution, this chapter connects pattern (crosses, pedigrees), mechanism (DNA replication, transcription, translation, mutation) and process (natural selection, speciation, Hardy-Weinberg) — a core IAT scoring area.
16 min read · Weightage 6–8 questions in IAT Biology
This chapter covers human health and disease (pathogens, immunity, cancer, drug/alcohol abuse), improvement in food production (plant breeding, animal husbandry, dairy/poultry, single cell protein, biofortification) and microbes in human welfare (fermentation, biogas, biocontrol, biofertilisers). IAT tests applied and mechanistic knowledge of these topics.
15 min read · Weightage 4–6 questions in IAT Biology
Biotechnology covers the principles and processes of recombinant DNA technology, and its applications in agriculture, medicine and industry, including transgenic organisms, gene therapy, and ethical/biosafety issues. IAT expects precise understanding of molecular tools (restriction enzymes, vectors, PCR, gel electrophoresis) and applied case studies (Bt cotton, golden rice, insulin production, gene therapy).
16 min read · Weightage 5–7 questions in IAT Biology
Ecology examines organisms in relation to environment across scales — population growth, community interactions, ecosystem energy flow and nutrient cycling — culminating in biodiversity patterns, conservation strategies and human impacts like pollution and global warming.
15 min read · Weightage 5–7 questions in IAT Biology
Sets, relations and functions form the logical backbone of the IAT Mathematics section. Questions test set operations and Venn-diagram counting, properties of relations (reflexive, symmetric, transitive, equivalence), and function concepts such as domain, range, injectivity/surjectivity, composition and inverses.
14 min read · Weightage 6-8 of the IAT Mathematics section
Algebra for the IAT spans complex numbers, quadratic and higher-degree equation theory, progressions, and the binomial theorem with permutations and combinations. The IAT rewards conceptual shortcuts — recognising a root relation, an AM-GM bound, or a binomial coefficient identity — over brute-force expansion.
16 min read · Weightage 8-10 of the IAT Mathematics section
Matrices, determinants and linear systems test algebraic manipulation of arrays alongside geometric reasoning about consistency of equations. IAT questions frequently combine determinant properties with matrix inverse computation and rank-based consistency checks.
15 min read · Weightage 6-8% of the IAT Mathematics section
Trigonometry connects angle measurement, identities, and equation-solving to geometric applications in triangles. IAT questions often require chaining multiple identities or combining trigonometric equations with range/domain restrictions.
15 min read · Weightage 6-8% of the IAT Mathematics section
Coordinate geometry links algebraic equations to geometric shapes — lines, circles and conic sections. IAT questions typically require identifying a conic's standard form from a general equation and then extracting focus, directrix or tangent-related quantities.
17 min read · Weightage 8-10% of the IAT Mathematics section
Vector algebra and 3D coordinate geometry combine to describe lines, planes and their mutual relationships in space. IAT frequently tests dot/cross product manipulation, shortest distance between skew lines and angle/plane equations.
16 min read · Weightage 6–8% of IAT Mathematics
Limits, continuity and differentiability form the rigorous foundation of calculus, connecting algebraic manipulation with the idea of instantaneous behaviour. IAT tests standard limit evaluation techniques, epsilon-style reasoning about continuity, and identifying points of discontinuity or non-differentiability.
16 min read · Weightage 7–9% of IAT Mathematics
Differentiation and its applications — limits, continuity, derivative rules, tangents/normals, monotonicity, maxima/minima and Mean Value Theorems — are heavily tested in the IAT. Speed comes from having standard derivatives and the chain/product/quotient rules automatic, then translating word problems into optimisation or rate-of-change setups.
17 min read · Weightage 10-12 of the IAT Mathematics section
Integration techniques (substitution, by parts, partial fractions), definite-integral properties, and area-under-curves problems are calculus workhorses for the IAT. Recognising the right technique and applying definite-integral symmetry properties saves significant time.
15 min read · Weightage 8-10 of the IAT Mathematics section
Differential equations test the ability to identify order/degree, form a DE from a geometric or physical condition, and solve first-order equations by variable separable, homogeneous or linear methods. IAT questions frequently combine formation with solving, or embed a growth/decay application.
13 min read · Weightage 4-6 of the IAT Mathematics section
Probability quantifies uncertainty through sample spaces, conditional probability and standard distributions, while statistics summarises data via measures of central tendency and dispersion. IAT problems mix classical counting-based probability with Bayes' theorem and binomial distribution numericals.
15 min read · Weightage 6–8% of IAT Mathematics
Mathematical reasoning covers statements, logical connectives, truth tables, and the validity of arguments. It is a low-formula, high-precision topic — most errors come from misreading a connective or a quantifier rather than from a computational slip.
10 min read · Weightage 2-4 of the IAT Mathematics section
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IISER / IAT free notes and chapter tests is part of the IISER IAT syllabus plan. Pick the batch by the year you appear in — Class 11 students join the two-year IISER IAT 2028 program, Class 12 students and repeaters join the one-year or crash program for IISER IAT 2027.
