Hii!
All the chapters of all three Subjects are equally important to prepare for Jee Mains and crack it with a good percentage. This is because you never know questions from which chapter appear in exam and which chapter is left out. So, prepare everything well. However, based on previous year question papers, we prepare a data for net weightage of chapters appearing in the exam. So, you can go through it in the link provided below and study accordingly.

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

Hope this helps.
Good luck!

Hi

Some of the  important topics or chapters based on their weightage in past year JEE examination is given below subject wise, you should stress more on these

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
Solid State And Surface Chemistry - 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
Three Dimensional Geometry:- 8 marks
Vector Algebra:- 8 marks

You can get chapterwise weightage for all the chapters for each of physics Chemistry and Maths by going through

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

Thank you

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