Hey aspirant
Hope your preparation is going well.
The important chapters include the following
Physics
1. Rotation
2. Thermodynamics
3. Waves
4. Optics
5. Modern physics
6. Electromagnetism
Mathematics
1. Coni section
2. Circle
3. Vectors
4. 3D geometry
5. Calculus
Chemistry
It includes whole of organic and inorganic portion. For physical Chemistry important topics are
1. Thermodynamics
2. Equilibrium
3. Atomic structure
4. Solution
5. Electrochemistry.
The weightage of each topic can be checked here
https://engineering.careers360.com/articles/jee-main-syllabus-weightage
Hope this helps
All the best

Hello Laxmi!
Jee main and jee advanced are the best way to get admission in top engineering colleges like IITs.
For jee main ,
For chemistry, NCERT books proper reading and revising again and again is must. The most asked chapter are- s- block, p block, d and f block, metallurgy ,hydrogen , chemical bonding , equilibrium, chemical kinetics , complete organic.
For maths , differentiation, integration, trigonometry, ap and gp , probability , permutations and combinations, differential equations are the most asked chapters.
For physics- kinematics, thermodynamics, properties of fluid , Rotational dynamic , electrostatic, current electricity , ray and wave optics , semiconductor devices , gravitation are msot asked chapter.
For jee advanced , questions based on the mixture of above topics are most important . These are high level problem which needs a dedicated practice.
All the best!

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