Hello,

Here is the list for the important chapters with high waitage

For biology it's divided into two that is zoology and botany starting from zoology

Zoology - human reproduction , evolution, immunity, animal kingdom (only from NCERT) 

Botany- plant kingdom, organisms and population, ecosystem, plant reproduction biological classification

This are some very imp chapters with high waitage of biology . Coming to physics and chemistry.

Chemistry- organic (very imp.) , Solutions , chemical bonding (again very very imp) electrochemistry , chemistry in daily life ,.NOTE - do not ignore inorganic chemistry it makes difference during the exam

Physics- laws of motion (v imp) { not many questions ask from this chapter but it's the basic for all the physics chapter don't ignore it} ,,,, optics , work energy and power, electrostatic , current energy 

Hope uh are clear now all the best for ur exam

Hello Rahul

Important chapters of Physics based on weightage of marks are

1.Thermodynamics

2.System of Particles and Rotational Motion

3.Electric Charges and Fields

4. Electrostatic Potential and Capacitance

5.Current Electricity

6.Electromagnetic Induction

7.Alternating Current

8.Ray Optics and Optical Instruments

9.Wave Optics

10.Semiconductor Electronics

Important chapters of Chemistry based on weightage of marks are

1. Chemical Bonding and Molecular Structure

2.Thermodynamics

3. Equilibrium

4. Solutions

5. p-Block Elements

6.Coordination Compounds

7. Aldehydes, Ketones and Carboxylic Acids

8.Alcohols, Phenols and Ethers

Important chapters of Biology based on weightage of marks are

1.The Living World

2.Biological Classification

3.Plant Kingdom

4.Animal Kingdom

5.Cell-The Unit of Life

6.Biomolecules

7.Cell Cycle and Cell Division

8.Digestion and Absorption

9.Breating and Exchange of Gases

10.Body Fluids and Circulation

11.Excretory Products and Their Elimination

12.Locomotion and Movement

13.Neural Control and Coordination

14.Principles of Inheritance and Variation

For more information regarding Weightage of marks for chapter wise refer the link below

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

Regards