hello sir.. can i just know the weightage of syllabus for both ncert and outside.. ?is it true that 60% of the paper is from 12th ncert bk?
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There's no such weightage for all three subjects, instead it is only the analysis of experts.Most of the questions of Chemistry in jee mains comes from NCERT and this is the scenario of every year.But for Physics and Mathematics,only concepts are there from NCERT books.You need to read NCERT books if you have to solve questions in jee mains exam.
Good luck.

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