I am in class 9 so I want to join IIT then I should start preparation of JEE main and jee advance from now
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Jee main and Jee advance are tough exams and one requires to work hard.
I advice you to lightly work with mathematics part of jee main because that you will understand at your age if you have already decided to start early.
Physics and chemistry are subjects which you can start during 11 STD.
Remember you also have to give 10 board soon, so mainly just concentrate on your present studies.
JEE Main 2025 College Predictor
Know your college admission chances in NITs, IIITs and CFTIs, many States/ Institutes based on your JEE Main rank by using JEE Main 2025 College Predictor.