hello aspirant......

to get an admission in nit you have to get atleast 75% above marks in 12th board exam conducted by the perspective board exam and for jee main eligibility as you belongs to sc category it not that difficult task for you to get a seat in nit but if you score above 100 you will be in a safe side and also you can get seat in good nit college

i hope this information is helpful

all the best.