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In order to crack JEE exam to get admission in top NITs and IITs your concepts should be clear. So, that you can easily solve tricky questions.

You can take help of NCERT books to build your concepts and fundamentals strong.

You should make a time table to devote time to each subject as per your weaknesses and strengths. You can set your daily, weekly and monthly targets. You can list all the topics which is remaining. So, that you can cover them on time and you get proper time for revision as well. You can set your priority list cover the topics which carries more weigtage in the exam first.

Solving previous year papers is the most important and required thing to do if you want to excel in JEE. It will provide you an insight into the type of questions, marking scheme and time duration. Solving these model papers will give you an idea about how the actual entrance exam will be.

All the best for your preparation and exam!!