Hello,

Here are some important chapters for JEE Mains:

Mathematics:

1. Calculus: Integral Calculus, Limits & Continuity, Differentiability, Application of Derivatives.
2. Coordinate Geometry: 3D Geometry, Coordinate Geometry, Vector Algebra.
3. Algebra: Complex Numbers and Quadratic Equations, Statistics and Probability, Permutations and Combinations, Sequence and Series.

Physics

1. Mechanics: Laws of Motion, Work, Energy and Power, Rotational Motion, Kinematics.
2. Thermodynamics & Waves: Thermodynamics, Oscillations and Waves
3. Electricity & Magnetism: Electrostatics, Current Electricity, Magnetism
4. Optics: Ray Optics, Wave Optics.

Chemistry

1. Physical Chemistry: Chemical equilibrium, Chemical; Kinetics, Thermodynamics.
2. I norganic Chemistry: P-block elements, Coordination Compounds, Periodic Table.
3. Organic Chemistry: Hydrocarbons, Organic Chemistry - some basic principles and techniques, Aldehydes, Ketones and Carboxylic Acid.

These are the high-weightage chapters; by focusing on these chapters, you can improve your score.

you can also check this link for more details:

https://engineering.careers360.com/articles/most-important-chapters-of-jee-main

I hope this answer helps you!