Hii

Firstly. I would to tell you that for being eligible for JEE Mains, you just need to qualify 12th Class. So, you are eligible for JEE Mains.

Secondly, after clearing JEE Mains & at the time of admissions to NITs/IIITs/GFITs-

• You need to have secured minimum 75% marks in class XII or equivalent exam or be in the top 20 percentile in their class XII exam conducted by the respective board.
• For SC/ ST candidates, the eligibility criteria is to secure 65% marks in class XII or equivalent exam.

So, you need 75%(General) & 65%(Unreserved) in 12th for getting admission in NITs/IIITs/GFITs.

All the best.