To get into NITs , candidates must have passed class 12th with a minimum of 75% aggregate. The minimum marks to get I to NITs through JEE mains is to get above 75% . To get into NITs, candidates need to prepare well and get a good score in JEE mains to secure their seat. For general category, cut off is little higher than for reserved categories. It's not easy and not soo difficult to get a seat in NIT. To know more about expected cut off for nit,check JEE mains cut off for NITs