Hey there

Do not loose hope if you have time left and you are interested in learning Physics and chemistry then you can get IIT. see if you are talking about UG courses at IIT then you will have to do JEE advance for that and for its preparation PCM should be very strong. Just start from basics try understanding basics of physics from unit and dimensions then kinematics then so on so forth. see physics is not hard you need a tutor who can teach you well. Use our Jee learning courses they will help you. For chemistry NCERT is best written study NCERT of 11th and 12th line by line trust me the book is fantastic.

check the link

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

good luck

Hello there,
Getting IIT is not an easy task, there are candidates who drop a year to prepare for IIT. So you cannot get IIT without studying Physics and Chemistry. You will not be qualified even for JEE Advanced, if you don't know physics and chemistry. Only maths cannot help you to get IIT. I would suggest you to try for IIT in the next year, with good preparation.
Hope this answer helps you.
Good luck!!