See marks will keep fluctuating year to year. Because they depend on various factors like number of candidates appearing and also the paper level,etc. So you can rely on the basis of ranks. I'll guide you with that. In 2017, the closing rank cutoff for btech CSE in NIT PATNA was 7,229 rank for general unreserved category. Obviously you haven't mentioned your category so I'm assuming you belong to unreserved General category. In 2016, it had a closing rank cutoff of 16569.

To know about the cutoffs of CSE in various other NITS available and to get a detailed information, do refer to our website..

https://engineering.careers360.com/articles/nits-cutoff-for-btech-computer-science-engineering

Best wishes. Thank-you.