Ideally the full JEE Syllabus is equally important as far as the Exam is concerned. However, there are certain Chapters, which perhaps have a Greater Weightage or tougher questions and must definitely be revised time to time.

For more information about Important Topics do follow the link below

https://engineering.careers360.com/articles/most-important-chapters-of-jee-main

Hi

Some of the  important topics or chapters for jee mains or do or die chapters or the chapters that you can't ignore for revision  based on their weightage in past year JEE examination is provided 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 comparatively focus more these high weightage carrying chapters and to plan your studies accordingly with the weightage you can go through chapter wise weightage of all the chapters for each of physics, chemistry and Maths for jee main by going through our page for which link is provided below

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

To help you boost your performance in jee main, we have jee main rank booster for you for which link is given below:-
https://learn.careers360.com/jee-main-rank-booster/

Thankyou