Hey.
Here is the chapter wise number of questions and marks respectively from each chapter of Physics. For chapter wise weightage of Mathematics and Chemistry you can use the link given in the end.
Modern Physics  5,  20
Heat and Thermodynamics  3, 12 
Optics  3, 12
Current Electricity  3,  12
Electrostatics  3 ,12 
Magnetics  2,8
Unit,Dimension and Vector  1, 4
Kinematics 1,  4 
Laws of motion 1 ,4 
Work,Power and Energy  1,4
Centre Of Mass, Impulse and Momentum  1, 4  Rotation  1, 4 
Gravitation  1,4 
Simple Harmonic Motion  1, 4
Solids and Fluids  1,4 
Waves  1,4 
Electromagnetics Induction AC  1,4 
https://engineering.careers360.com/articles/jee-main-syllabus-weightage
Best of luck!

There is no any weightage defined chapterwise by joint entrance board . But, there is weightage defined by subjectwise so , all chapters in the syllabus are equally important. So just go through the syllabus and only you can analyse the most important chapters from previous years questions.

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