Hey!

If you have strong fundamentals, then you just need to revise all the syllabus once and solve the mcqs. As now almost 15 days are left for the exam, so you should solve the previous years problems, this will help you to have an idea about the type of questions asked and in which pattern. This will also help you to learn your weak points and time management. But only solving previous years problems as your preparation for JEE mains doesn't guarantee you to achieve good marks. You need to work hard.

Thank you