Hoping that your basics are clear by now and the concepts are strong as well. So this is the time when you practice more and more multiple choice questions for all the subjects so that you get exposed to maximum types and patterns of questions that are asked in the exam. Also solve JEE last 30 years paper, they will help you a lot as well, also your confidence will be boosted by this. Try to rectify your mistakes by reading those concepts and this sample papers will give you a good reality check of yourself as in where do you stand and how you have to process ahead to be in the top.

Kindly refer to the site below for knowing some tips for the exam and also for solving some sample papers..

https://engineering.careers360.com/articles/jee-main-preparation-tips

https://engineering.careers360.com/articles/jee-main-sample-papers

Best wishes. Thank you.