Hello student as examination is knocking on the door you don't have much time to start from the scratch in this time I'll not suggest you to read any new topic just practice topics which you've already studied. Practice previous year question papers of Jee main,so that you can get a overview of examination.

Solve mock test paper and previous year question as much as you Can because Maths is a subject which is only get in command with the help of practice.

Feel free to comment if you've any doubt

Good luck