Hi

Chapters weightage is not fixed, but yes b ased on analysis of past year question papers of Neet examination, chapter wise weightage for NEET 2021 is provided below for each of physics chemistry biology is provided below subject wise

-------------) PHYSICS

*Physical-world and measurement:- 2%

*Kinematics:- 3%

* Laws of Motion :- 3 %

* Work, Energy and Power :- 4 %

* System of Particles and Rotational Motion :- 5 %

* Work, Energy and Power :- 4 %

* Gravitation :- 2 %

* Properties of Bulk Matter :-3 %

* Thermodynamics :- 9 %

* Behaviour of Perfect Gas and Kinetic Theory :- 3 %

* Oscillation & Waves :- 3 %

* Electrostatics :- %

* Current Electricity :- 8 %

* Magnetic Effect of Current & Magnetism :- 5 %

* Electromagnetic Induction & Alternating Current :- 8 %

* Electromagnetic Waves :- 5 %

* Dual Nature of Matter and Radiation :- 6%

* Atoms & Nuclei :- 3 %

* Optics :- 10 %

* Semiconductor Electronics :- 9 %

-------------) CHEMISTRY

*    Basic Concepts of Chemistry   :- 1  %

* Structure of Atom :- 2 %

* Classification of Elements & Periodicity in Properties :- 2%

* Chemical Bonding and Molecular Structure :- 5 %

* States of Matter: Gases and Liquids :- 2 %

* Equilibrium :-6 %

* Thermodynamics :- 8 %

* Redox Reactions :- 3 %

* s-Block Elements :- 2 %

* Some p-Block Elements :- 2 %

* Organic Chemistry: Basic Principles & Techniques :- 4 %

* Hydrocarbons :- 3 %

* Environmental Chemistry :- 2 %

* Solid State :- 2 %

* Solutions :- 5 %

* Electrochemistry :- 2 %

* Chemical Kinetics :- 3 %

* Surface Chemistry :- 2 %

* Isolation of Elements :- 2 %

* p-Block Elements :- 5 %

* d- and f-Block Elements :- 4 %

* Coordination Compounds :- 9 %

* Haloalkanes and Haloarenes :- 3 %

* Alcohols, Phenols and Ethers :- 4 %

* Aldehydes, Ketones and Carboxylic Acids :- 4 %

* Organic Compounds containing Nitrogen :- 2 %

* Biomolecules :- 3 %

* Polymers :- 3 %

* Chemistry in Everyday Life :- 2 %

-------------) BIOLOGY

*    Diversity of Living Organisms  :-   14%

* Structural Organisation in Plants & Animals :- 5 %

* Cell: Structure and Function :- 9 %

* Plant Physiology :- 6 %

* Human Physiology :- 20 %

* Reproduction :- 9 %

* Genetics and Evolution :- 18 %

* Biology and Human Welfare :- 9 %

* Biotechnology and its Applications :-4%

* Ecology and Environment :- 6 %

You can get detailed information regarding chapter wise weightage of all the chapters for each of physics, chemistry and Biology for neet by going through our page for which link is provided below

https://medicine.careers360.com/articles/neet-chapter-wise-weightage-and-important-topics/amp

This chapterwise weightage  will help you a lot  in  planning your studies for Neet examination, you can comparatively stress more on chapters having higher weightage.

To prepare well for neet, we have neet knockout for you for which link is given below:-

https://learn.careers360.com/knockout-neet

Thank you