Hello student to get admission into NIT's you need to secure around 98-99 percentile as we all know that seats are very limited and admission is directly based on merit rank. Cutoff vary every year on various factors like the level of question in the entrance examination and total number of applicants in that examination to qualify Jee main examination for Jee advance its expected that cutoff will around 89 percentile for Genral category students.

Feel free to comment if you have any doubt

Good luck