Hello,
There is not much difference in obc category students and general students.You need to score a minimum of 170 marks in jee mains to get your choice of branch in a good NIT.But to get any NIT with any branch  140 will be wnough score.To get details of cutoff trends of NITs you may click the below given link:
https://www.google.co.in/amp/s/engineering.careers360.com/articles/jee-main-cutoff-for-top-nits%3famp
All the best!:)

There are various colleges that participate in the JEE mains exam for the seat allocation to the students so for the OBC category student I would suggest you to score 150 + marks to remain on the safe side and you could get a better branch also.

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