Hello Dear,

First and foremost you should focus on proper clarity of your subjects. The concepts of 11th and 12th should be on your tips.

And when the concepts you have complete hold on try to solve its objective type questions daily.

When you are done with a chapter, try solving previous year paper of that chapter.

Also, if you can't self study then you can also visit the following link, where you will get full preparation of IIT entrance from A to Z-

https://learn.careers360.com/knockoutfull-jee-main-april/

Good Luck :)