Hello,
To prepare for JEE mains and score good, you need to do justice to all the topics of the syllabus for JEE mains. But as you have less time now, and to atleast clear the cutoffs for jee mains, you can clear the topics which have the more expected weightage. Please note that, JEE mains chapter weightage is not always accurate as the authorities of JEE mains might change the pattern every year. But you can be in the safe side if you atleast get an idea from it.
Here's the link for JEE mains syllabus with weightage. https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-syllabus-weightage/amp
Hope it helps

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