Hello Ronak,

To prepare for JEE Main studying NCERT thoroughly is advisable. However, you can enhance your preparation by referring to the side books of authors like H.C. Verma, R.D. Sharma, O.P.Tondon, etc. Please refer to the articles JEE Main important books and topics. The link has been provided below for the same.

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https://engineering.careers360.com/articles/jee-main-important-topics-books

You can also download JEE Main Important Topics and Books- Ebook