How how to study for IIT JEE? Answer is simply here
To do so first :
Search three teachers who can suggest you good books if you are in junior classes or not in a coaching classes.
These three teachers should be of PCM that is physics Chemistry Maths.
Ask them few good books for IIT JEE and always prepare with motivations
if you don't have a teacher or anyone don't worry I am giving you a link below just do a poor and start getting good books and good tips for IIT JEE.
https://steemit.com/iit/@ankit-752/iit-jee-books
Now the final step is to start the preparation just go ahead and prepare very well for these exams.