Hello Niranjan.

See u haven't cleared the min. Eligibility criteria for the qualifications of the JEE MAINS i.e. 75% aggregate in the boards exam so u won't be able to secure a seat in the NITs for pursuing ur higher studies in the field of ur interest under btech courses. U should be going for state colleges and private institutions for ur btech career.

Hope it helped u. Ask if any query

Good luck