Hello Shiva, Well, the only tip to crack IIT is "Continous Hard work every day until exam". You need to follow the instruction of your coaching teacher if you study at coaching. Follow the books they tell you. Keep studying from their notes. Avoid learning any new concept at last time because it might cause stress which is not good. Solve your coaching booklet.

Dedication

Hardwork

Commitment

Clear concepts and excellent problem solving skills

These will help you to clear iit