Hey Jatin.

See first of all make out a plan of the wightage of different topics of each subject. Focus on the heavily wighted topics first to complete them as soon as possible. Take one hard and one soft topic at atime to balance ur mind. After completing these start on the revision part by practicing the sample papers of different competitive exams.

With this u will be able to get the loose points of ur study. Fix them and try practicing the previous year JEE MAINS questions for more practice. After completing all these start to focus on time management by practicing the new unsolved papers in given time. Make formula books and short notes wherever required for ur help.

Hope this helps u. Ask if any query.

Good luck