Hello

For SC / ST, the eligibility is to obtain a minimum of 65% mar... As per the JEE Main eligibility criteria, For admissions in NITs / IIITs/ GFTIs : Candidates should have obtained a minimum of 75% marks in class 12 or equivalent exam or they must be in the top 20 percentile in their class 12 examination.
So as you are a student of SC category, then you are definitely eligible for admission in government colleges like NITs or IIITs since you have scored 65% marks in class 12th board exams.Participate in JOSAA counselling to get admission in NITs.

Good luck.