Hello.

Some chapters which usually have higher weightage:

Physics: Thermodynamics, Ray Optics, Semiconductors, Photoelectric Effect and Mechanics, Capacitors, Electromagnetic induction and AC.

Chemistry: Inorganic(highest weightage), Electrochemistry, General Organic Chemistry, Aldehydes and Ketones, Thermodynamics.

Mathematics: 3 Dimensional Geometry, Conics, Probability, Complex Numbers, Definite Integral.

Try to solve the chemistry part in the exam first as it requires comparatively less time than other subjects. Hope this helps.

Good luck.

Here are the important topics, you can check given below for the exam preparation.

The important topics to study:

Physics

Mechanics- 30%

Heat & Thermodynamics -7%

Electrostatics & Current Electricity- 17%

Magnetics & Electro Magnetic Induction- 13%

Optics & Waves- 3%

Modern Physics- 10%

Simple Harmonic Motion, Waves & Elasticity- 7%

Semi-Conductor Devices, Electromagnetic Waves and Principles of Communication- 13%

Chemistry

Organic Chemistry- 30%

Inorganic Chemistry- 30%

Physical Chemistry- 40%

Mathematics

Co-Ordinate Geometry- 17%

Calculus- 27%

Algebra- 27%

Vector/3-D Geometry- 10%

Trigonometry- 6%

Sets & Relations, Mathematical Reasoning, Statistics- 13%

You can also prefer the below given link to check the complete information

https://engineering.careers360.com/articles/jee-main-important-topics-books

Good Luck!