Hii!
Firstly, let me tell you that all the chapters of all the three subjects, that is, Physics, chemistry and Maths are important. Questions from some chapters appear one year which may not appear next year. So, you need to study all.
As per the analysis of previous year question papers, we get to know the weightage of each chapter in the exam, which are likely to come. The link given below may help you with it.

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

Analyse it, and prepare accordingly.

Hope this helps.
Good luck!

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