Hello Aspirant.

You've just cleared your high school with quite an impressive percentage,now to crack JEE mains and advanced you must first opt be a bit serious than before.

1. In 11th and 12th you'll be studying PCM and that entire PCM is the syllabus for both the JEE examinations. Study those topics hard and always be with a focussed mind

2. If you want/ Can manage, then join a coaching institute as it'll help you with topics that are not taught , test series etc. Inshort, it'll be a lot beneficial

3. Study these two years seriously as you're aim is a good way to go and will need devotion.

Best of luck !