There are many chapters but you have to study all the syllabus because you can not depend upon some of the topics.
Sometimes we are unable to solve at that time so it is better to prepare with full syllabus.
Btw most important topics are:
Algebra
Statistics
Calculus
Permutation and combination

Inorganic chemistry
Physical: thermodynamics ; gases ; solutions
Organic is the main part of chemistry.

Physics: electrostat; rotation; optics
Fluids;  mechanics.
But they are interrelated.
Good luck.

hello,

you can refe these links to know the jee mains chapter with its weightage:

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

and to know important topics and tips:

https://engineering.careers360.com/articles/jee-main-2019

copy the links and paste it in the address bar of your browser.

all the best!

I Hope this information will be useful to you.

if you need additional information,let us know to help you.

Thank you!!!:)

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