Hello aspirant

For admissions to NITs  / IIITs  / GFTIs Candidates need to have secured a 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 are to secure 65% marks in class XII or equivalent exam.

For admissions to B.Arch. programmes:

Candidates need to have PCM mandatorily in their 10+2 or equivalent exam.

They need to have secured minimum 50% marks in these subjects in aggregate and 50% individually too

For more information refer

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-eligibility-criteria/amp

To predict college that you get refer 

https://engineering.careers360.com/jee-main-college-predictor

All the best.