I have already prepared some chapters How can I prepare in these 30 days Give me some suggestions

Dear aspirant, First of all, you need to create a timetable for yourself, A well-designed timetable which will suit you and you can follow that for the next 30 days with whole dedication and in a disciplined manner.

You have 30 days to prepare for JEE mains so the basic idea should be dividing your time equally for the three subjects.

That is 8 days each for physics, chemistry, and maths. The remaining 6 days you just have to revise, you do not need to start with any new topic or practice new problems, you just need to focus and revise thoroughly whatever you will study during these 24 days

You need to take two subjects simultaneously, study one in the morning and the other one in the evening, revise again and give a test of the same topic at night. Try to maintain and increase your marks gradually by improving on your weaker areas.You must analyze and choose good study material for study and try to concentrate on the concept. You should also prepare a list of important formula from each chapter. Try and make a note of the tips for a quick solution to problems.

All the best

Hope this helps