Can anyone tell me is it important to do other books beside my coaching package to crack iit jee with good rank?
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It is not compulsory that you have to refer lot of books to crack IIT JEE exam. NCERT and your coaching package is enough.
You should practice previous year papers to understand the exam pattern and level of questions. Solve as many as mock test series to analyze your preparation level at regular interval of time make sure you analyze your paper. So, that you learn from your mistakes.
Good Luck!!

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