Hello,

Class 10th science just contains the basics of Class 11th and 12th. Getting 90 percent in Science in class 10th is great but it  depends on your hardwork. You will have to understand a lot of concepts, memorise formulas and lot more.Science is not a stream wherein you can byheart lessons. Coming back to crack IIT you will have to concentrate on Formulae, Theorem, and Reactions. You can study form learning apps, Watch tutorials, ask your teachers for doubts, look for someone who have cracked IIT communicate with her/him, start studying from day 1, stay focused towards your goals, be consistant, study for atleast 5-6 hours daily, always be positive. Hope this helps you.

all the best.