Hii Prabhav!
Firstly, Rome was not made in a day. Similarly, you can't prepare for an exam just in one month if you aren't prepared a bit earlier. You can only do this if you have already studied the main portions and want to revise the same. The important chapters from class 11th physics having more weightage in Jee Mains are-
Units and dimensions, waves, simple harmonic motion, rotational motion, Newton's laws.
Still, other chapters are also important. So, do not leave any of them. Prepare well.
Hope this helps.
Good luck!

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