I can't tell you the important chapter.As every chapter is important.
You can see that there are 30 ques asked in jee mains in maths section and there are about 32 chapters from 11 &12th. So we can guess that  there may be one ques from each chapter.Hence each and every chapter is important.

We have about 4 months lefted ,so i can only suggest you that whatever you study (15-20 chapters out of 32) , study deeply and in conceptulised way so that any question came from that chapter can easily be attempted.

But if you are able to do all chapters than it is good. So

All the best !!

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