Hi there as per your obc category rank in jee mains and according to this year cut off the probability of you to get cse in nits are less. But you apply for the other core branches in nits and some of the nits are

NIT NAGPUR  MECHANICAL ,Civil, electricals engineering

NIT PATNA  ENTC , Mechanical, Civil

NIT SRINAGAR  CSE,ENTC,EEE,CIVIL

For CS you can also apply for iiits and gftis or the other government colleges in your state and other state.