Hello aspirant, I hope you are doing good.

For IIT , first of all you have to clear your mains exam . When result comes, see your percentile has overcome the minimum percentile and then JEE advanced is will be held . This is one of the toughest exam so be to sure to practice harder and clear all your doubts so that you sit in the exam a bit of confidence.

I hope this helps .

Hello! Hope you are doing good

Firstly, you need to qualify JEE- Mains. The ones who qualify the cutoff as per the list released are eligible to give JEE- Advanved.

Being one of the toughest exams, the syllabus is quite vast and it would become very lengthy to discuss here so please refer the following link for syllabus: https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-syllabus/amp

Hope it helps. All the best