Hello Aspirant,

To be eligible for NITs one needs at least 75% marks in aggregate in class 12 if belong to the general category.

official eligibility criteria states "Students should have passed the 12th class with a minimum of 75% marks or they should be in the top 20 percentile in their class 12 exam (65% for SC/ST candidates)"

For more information you can check their official website: https://www.nitt.edu/home/academics/admission_procedure/