Hi candidate,

For JEE-Main, chapter-wise weightage is given below for each subject and for important chapters :

Physics

• Modern Physics:- 20 marks
• Heat and Thermodynamics :- 12 marks
• Optics:- 12 marks
• Current Electricity :- 12 marks
• Electrostatics :- 12 marks
• Magnetics :- 8 marks

Chemistry

• Transition Elements and Coordination Chemistry  :-  12 marks
• Periodic table and Representative Elements :- 12 marks
• Thermodynamics And Gaseous State:- 8 marks
• Atomic Structure:- 8 marks
• Chemical Bonding:- 8 marks
• Chemical And Ionic Equilibrium:- 8 marks
• Nuclear Chemistry And Environment:- 8 marks

Mathematics

• Coordinate Geometry  :-  20 marks
• Limits, Continuity and Differentiability :- 12 marks
• Integral Calculus :- 12 marks
• Complex numbers and Quadratic Equation :- 8 marks
• Matrices and Determinants :- 8 marks
• Statistics and Probability :- 8 marks
• Vector Algebra :- 8 marks

For complete details, kindly check out the links given below :-

https://engineering.careers360.com/articles/jee-main-syllabus-weightage

I hope this information helps you.

Regards,
Ishan