Hello,
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Every year the question paper changes and there are only few Chances of getting repeated questions in the next appearing examination.
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So, if you focus on the important topics rather then previous question papers it will be more beneficial for you.
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Prepare your self From important topics and then test by solving out model papers or question papers. In this way you  will get to know how much you have prepared.
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Here is the link for important topics, authors and subjects for preparation
https://engineering.careers360.com/articles/jee-main-important-topics-books

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