NEET-UG is a 720-mark paper: 180 questions, four marks for a correct answer, one negative mark for an incorrect one. Biology contributes 360 marks, Physics 180 and Chemistry 180. What the National Testing Agency publishes is the syllabus and the exam pattern — it does not publish a chapter-wise mark distribution. So every weightage table, including the ones below, is an estimate reconstructed by counting questions across recent NEET papers.
That distinction matters. Weightage is a revision-priority tool, not a syllabus-cutting tool. Used correctly it tells you which chapters deserve three revisions and a dedicated question bank, and which deserve one clean NCERT pass. Used incorrectly it becomes an excuse to leave holes that a single paper can punish.
How to read the tables below
Each chapter is placed in a band rather than given a false-precision percentage, because question counts move between years:
- High yield — has repeatedly contributed multiple questions per paper. Master first, revise last.
- Medium yield — usually one to two questions. Full coverage, moderate practice depth.
- Support — often a single question, sometimes none. Cover at NCERT level so a direct question is never lost.
Bands reflect observed trends across recent NEET papers. Always cross-check the current syllabus on the official NTA website before you plan a year, because the syllabus itself has been revised in the past and rationalised NCERT content has shifted what is examinable.
Biology: 360 marks, the section that decides your rank
Biology carries half the paper and rewards precise recall over speed. Ninety questions are drawn from Botany and Zoology combined, and the distribution has consistently leaned towards a handful of large units.
| Unit / chapter | Band | Why it behaves this way |
|---|---|---|
| Human Physiology (digestion, breathing, circulation, excretion, neural, chemical coordination) | High yield | The single largest cluster of questions in most papers; heavily diagram- and table-based in NCERT |
| Genetics and Evolution (principles of inheritance, molecular basis of inheritance) | High yield | Combines recall with reasoning; molecular biology questions are dense and repeatable |
| Cell Structure and Function, Cell Cycle | High yield | Short chapters with very high question-per-page density |
| Plant Physiology (photosynthesis, respiration, transport, growth) | High yield | Process-heavy; questions test sequence, site and product accuracy |
| Ecology and Environment | High yield | Fact-dense, quick to revise, historically generous in question count |
| Biotechnology and its Applications | Medium to high | Small syllabus footprint, disproportionate question return |
| Reproduction (human, flowering plants, reproductive health) | Medium to high | Diagram and terminology precision decides the marks |
| Biological Classification, Plant and Animal Kingdom | Medium | Pure recall; examples and defining features matter more than descriptions |
| Structural Organisation in Animals and Plants | Medium | Anatomy of flowering plants and morphology reward diagram reading |
| Microbes in Human Welfare, Human Health and Disease | Medium | Name-to-function mapping; easy marks when tabulated |
| Living World, Biomolecules, Transport in Plants (overlaps) | Support | One question territory, but cheap to secure |
Practical consequence. If Human Physiology, Genetics, Cell Biology, Plant Physiology and Ecology are genuinely strong, you are already competing for the top of the Biology section. Students who lose marks here rarely lose them to unseen content; they lose them to close options — for example confusing hormone source with hormone target, or misplacing a step in glycolysis.
How to revise it. Read NCERT line by line, then convert every process into a table or flow diagram in your own handwriting. Recall from your own table, not from re-reading the book, because re-reading creates familiarity rather than retrieval. Aim for at least three passes of the high-yield units before the final month.
Chemistry: 180 marks across three unequal parts
Chemistry behaves like three subjects with different scoring rules. Broadly, Physical, Organic and Inorganic each contribute a meaningful share, with Organic and Inorganic often edging ahead in question count.
| Area / chapter | Band | Notes |
|---|---|---|
| Organic: General Organic Chemistry, Hydrocarbons, Haloalkanes and Haloarenes | High yield | Mechanism and stability logic transfers across every other organic chapter |
| Organic: Alcohols, Phenols and Ethers; Aldehydes, Ketones and Carboxylic Acids | High yield | Named reactions and conversions are directly examinable |
| Organic: Amines, Biomolecules | Medium to high | Biomolecules is largely recall and pairs well with Biology revision |
| Inorganic: Chemical Bonding and Molecular Structure | High yield | Underpins questions in several other chapters |
| Inorganic: Periodic Table and Periodicity, p-Block, d- and f-Block, Coordination Compounds | High yield | Coordination Compounds is reliably productive; trends questions are quick marks |
| Physical: Equilibrium, Thermodynamics, Chemical Kinetics, Electrochemistry | High yield | Formula-driven; a small set of standard problem types repeats |
| Physical: Solutions, Atomic Structure, Mole Concept and Stoichiometry | Medium to high | Mole concept quietly feeds numericals across the paper |
| Physical: Solid State, Surface Chemistry (where in syllabus) | Medium | Check the current syllabus; content has been rationalised in the past |
| Environmental Chemistry, Practical-oriented topics | Support | Low count, low cost to cover |
Practical consequence. Inorganic Chemistry is the highest return-on-time area in the entire paper for a disciplined student, because most of it is memorisation of trends, exceptions and reaction outcomes straight from NCERT. Organic Chemistry rewards understanding a few mechanisms deeply rather than memorising hundreds of reactions. Physical Chemistry is where a student without numerical practice quietly leaks 20 to 30 marks.
How to revise it. Keep three separate error logs. For Inorganic, log exceptions. For Organic, log reagents you misread and conversions you could not complete. For Physical, log the exact step where the calculation broke — unit conversion, sign convention, or formula selection. Reviewing three narrow logs beats reviewing one general one.
Physics: 180 marks, where accuracy costs the most
Physics has the fewest questions relative to difficulty and the highest time cost per question. Mechanics and Electrodynamics together dominate the section in most papers.
| Chapter cluster | Band | Notes |
|---|---|---|
| Mechanics: Laws of Motion, Work Energy Power, Rotational Motion, Gravitation | High yield | Rotational Motion is a frequent differentiator between score bands |
| Electrodynamics: Current Electricity, Electrostatics, Magnetic Effects of Current, EMI and AC | High yield | Largest combined cluster after Mechanics |
| Modern Physics: Dual Nature of Radiation, Atoms, Nuclei, Semiconductor Electronics | High yield | Short, formula-light, high accuracy potential |
| Optics: Ray Optics and Wave Optics | Medium to high | Standard question templates repeat across years |
| Thermodynamics and Kinetic Theory | Medium to high | Overlaps directly with Physical Chemistry |
| Oscillations and Waves | Medium | Reliable single-question territory |
| Units and Measurement, Motion in a Plane, Properties of Matter | Medium | Dimensional analysis questions are fast marks |
| Communication-type and low-count topics | Support | Cover at NCERT depth only |
Practical consequence. Modern Physics and Semiconductors deserve more attention than students give them: the concepts are compact, the question types are limited, and accuracy there is achievable within weeks. Meanwhile Rotational Motion and EMI are where under-prepared candidates lose the most marks, because both punish shallow formula memorisation.
How to revise it. Work in problem sets of ten from one chapter at a time, timed at roughly 60 to 75 seconds per question. Anything you could not start within 20 seconds goes in the log as a recognition failure, which is a different problem from a calculation failure and needs a different fix — more exposure to question types rather than more algebra practice.
Turning weightage into a study order
Weightage only helps if it changes the order of your week. A workable sequence:
- Secure Biology high-yield units first. They carry the largest mark block and the fastest revision cycle. Human Physiology, Genetics, Cell Biology, Plant Physiology and Ecology come before anything else in a revision phase.
- Add Inorganic Chemistry in parallel. It is memory work, so it fits into short, low-energy study slots that would otherwise be wasted.
- Build Physics Mechanics and Electrodynamics with problems, not notes. These clusters need volume; reading them does almost nothing for your score.
- Layer Organic Chemistry around a mechanism spine. Learn GOC properly once, then the individual chapters become variations rather than new content.
- Sweep the support chapters last, at NCERT level. One clean pass, one set of practice questions, no guilt about not going deeper.
- Test full papers, then re-weight. Your own error log overrides any generic weightage table. If you lose 24 marks a paper in Organic Chemistry, Organic is your highest-weightage chapter regardless of what the national trend says.
Mark arithmetic worth memorising
- A wrong answer costs five marks relative to a correct one (+4 forgone, −1 imposed). Twenty wrong answers remove roughly 100 marks of headroom.
- Ten unattempted questions cost 40 marks; ten incorrect ones cost 50. When confidence is near a coin flip, leaving it blank is a scoring decision, not timidity.
- A 650 profile usually looks like 330 or more in Biology, 145 to 160 in Chemistry and 130 to 150 in Physics. Notice that no realistic profile reaches 650 with a weak Biology section.
The four mistakes weightage tables cause
- Skipping support chapters entirely. One direct question you cannot answer is four marks plus the confidence cost mid-paper.
- Treating a table as fixed. Question counts drift every year. Bands are stable; exact numbers are not.
- Front-loading only the interesting chapters. High-yield chapters are frequently the least glamorous — Ecology, Periodicity, Modern Physics.
- Ignoring your own data. After five full-length papers, your personal error distribution is more predictive of your final score than any published weightage list.
Verify before you plan
Before locking a year-long plan, check the current syllabus and exam pattern on the official NTA site and the current NCERT textbook editions for your class. Syllabus rationalisation has changed what is examinable in the past, and a weightage table built on an older syllabus can quietly send you into content that no longer counts.
Weightage tells you where the marks usually live. Your mock-test error log tells you where your marks are actually going. Plan with the first, adjust with the second, and revise the high-yield blocks often enough that they stop being a risk.
A 90-day plan driven by weightage
Weightage becomes real when it appears on a calendar. A three-month window before the exam, assuming the syllabus is already covered once, can be split as follows.
Days 1 to 30 — high-yield consolidation. Six days a week, three study blocks a day. Block one is Biology high-yield: one unit from Human Physiology, Genetics, Cell Biology, Plant Physiology or Ecology, revised from your own tables and then tested with 40 questions. Block two alternates between Physics Mechanics and Electrodynamics, 25 timed problems each session. Block three is Inorganic Chemistry recall plus one Organic mechanism family. End every week with one full-length paper and a two-hour analysis sitting.
Days 31 to 60 — medium-yield coverage and error repair. Keep the Biology block, but rotate in Reproduction, Biotechnology, Classification and Microbes. Physics moves to Optics, Thermodynamics, Modern Physics and Oscillations. Chemistry adds Physical Chemistry numericals in volume, since this is where most 550-band students lose marks silently. Two full papers a week from here, each analysed before the next one begins.
Days 61 to 90 — retrieval, speed and support chapters. No new content. Each day is a mixed recall session across three high-yield units, one timed sectional test, and one short sweep of a support chapter at NCERT depth. In the last ten days, revise only your own error log, your handwritten tables and NCERT diagrams.
Discipline that protects high-yield marks
Three habits matter more than any table.
Read NCERT at line level for Biology and Inorganic Chemistry. Captions, tables, boxed examples and diagram labels are all examinable. A question built from a single NCERT line is worth exactly as much as a three-step Physics numerical, and costs a fraction of the time to secure.
Keep one error log per subject, weighted by marks. Sort it by how many marks the mistake type has cost you across the season, not by when it happened. The top five rows of that list are your true priority chapters.
Protect Biology accuracy above everything. It is the only section where near-perfect performance is repeatable across papers, and no realistic top-band score survives a weak Biology section. When time is short, Biology revision wins the slot.
If you want this converted into a dated plan around your school schedule and current mock scores, the Prepkunj academic team can map your weightage priorities to a week-by-week timetable.
Related reading
- How to score 600 in NEET — turning weightage into a score plan.
- CBSE Class 12 complete study guide — board chapters behind these marks.
- How to Score 700 in NEET — how to use weightage at the top band.
Related guides
Frequently asked questions
- Does NTA publish official chapter-wise weightage for NEET?
- No. NTA publishes the syllabus and the exam pattern, not a chapter-wise mark distribution. Every weightage table you see online, including this one, is an estimate built by counting questions across past NEET papers. Use it to prioritise revision order, never as a reason to skip a chapter that is in the official syllabus.
- Which subject carries the most marks in NEET?
- Biology, with 360 of the 720 marks across Botany and Zoology. Physics and Chemistry carry 180 marks each. That is why Biology accuracy usually decides the final score band more than Physics problem-solving speed.
- Can I skip low-weightage chapters?
- Skipping is risky because weightage fluctuates year to year and a chapter that contributed one question in one paper has contributed three in another. A safer approach is tiering: master high-yield chapters first, then cover low-yield chapters at NCERT level so you can still answer a direct, single-line question.
- How many NEET questions come directly from NCERT?
- For Biology and Inorganic Chemistry, a large majority of questions are traceable to NCERT lines, diagrams or tables. Physics and Physical Chemistry need NCERT concepts plus dedicated numerical practice, because the questions test application rather than recall.
- What is a realistic section-wise target for 650 marks?
- Roughly 330 or more in Biology, 145 to 160 in Chemistry and 130 to 150 in Physics. Biology is the only section where near-perfect scoring is repeatable, so it should be the most protected part of your revision plan.
- How should weightage change my mock-test analysis?
- Weight your error log by marks at stake. Two repeated mistakes in Human Physiology or Organic Chemistry cost far more over a season than one mistake in a single-question chapter, so fix high-yield errors first.
About the author
Prepkunj Academic Team · Physics, Chemistry, Biology and Mathematics faculty
The Prepkunj Academic Team prepares and maintains every Learning Hub resource using live classroom experience with NEET, JEE, BITSAT, IAT and CBSE students.