If you are aiming Joint Entrance Examination (Main), or JEE (Main), and have decided to pursue Computer Science and Engineering in one of the National Institute of Technologies, then you will have to score a high percentile as getting admission in to the CSE department of the NITs is quite a daunting task. I'm going to provide you the cut-offs of the some of the last closing CSE NITs for 2021:

1.  NIT Mizoram: 31,967 (closing rank)

2. NIT Nagaland: 31,230 (closing rank)

3. NIT Meghalaya: 19,728 (closing rank)

All these ranks are OS and indicate that in the worst case scenario, you'll be needing a percentile of around 97 to get admission into one of the NITs. All the best!