Hey Chintarama Rao

As per your question the minimum percentile required for an obc ncl candidate to get asmission in any of the courses in any of the NITs is between 85 to 90 (varies every year) if you are from north eastern states of India(domicile resident). However if you are from the states having good NITs like Trichy or Warrangal you need to have around 98 percentile. Even for states like Bihar, UP and WB you need to have around 96 percentile to get into a nit.

All the best!