Hello Aspirant..

Hope you are doing good.

it changes year to year based on many factors but generally,

As an OBC candidate, you should aim for a score of 87-89 if you want to be admitted to NIT through the Home State Quota and at least 90-92 if you want to be admitted through the Other State Quota.

For marks in category wise, please visit

https://www.careers360.com/question-im-oc-boy-how-many-marks-should-i-get-in-jee-main-to-get-cse-seat-in-a-good-nit#:~:text=If%20you%20are%20a%20ST,CSE%20department%20in%20top%20NIT'S%20.

Hope this information helps you...

All the best.