You can go through below details for the same -

Qualifying marks criteria for B. E./B. Tech at NSIT:
Students must have secured at least 60% aggregate marks or more in Physics, Chemistry and Mathematics at Senior School Certificate Examination Level/XII.
Besides this, they should also have passed English as a subject (Core or Elective) at Senior School Certificate Examination Level.
Each of the above subjects needs to be passed individually/separately.

For more information, you can go through below link -

NSIT Admission criteria

Hope this helps!!!