if you have scored more than 75% than you are eligible for IIT JEE Exam. you can prepare for iit exam as go through your ncerts , understand the concepts, practice a lot more. Practice makes a man perfect. Just believe in yourself. I have provided the link, just go through it. It will help you.

https://www.homeworkonweb.com/2018/09/25/iit/

Thanks

• Just go through with the topics of PCM thoroughly as well as you should must also known the important topics as well.
• Since there is not enough time for the preparation of JEE main 2019 session. So you should try to cover all the major topics completely and after that do the revision.
• Prepare your time table which includes your preparation strategies that you need to do by yourself.
• Try to complete the NCERT first and after than go to the other reference books.
• Believe in yours preparation rather than your luck .