Hello Niroja

While appearing for JEE, it is important to know what is the weightage of chapters so you can find the most important topics.

A study done by Careers360 has revealed that in:

1. Physics: Optics was the most important (12.60%) followed by Electrostatics (10.20%) and Properties of Solids and Liquids (8.60%)
2. Chemistry: Co-ordination Compound was the most important (9.33%) followed by Chemical Thermodynamics (7.11%) and Some Basic Concepts of Chemistry (7.11%)
3. Mathematics : Coordinate Geometry was the most important (19.11%) followed by Integral Calculus (10.22%) and Limit, Continuity and Differentiability (10.22%)

For the full study, Refer: JEE MAINS CHAPTER WISE WEIGHTAGE

Hope this answer helps! Thank You!!!