Different colleges have different cutoff for all the streams in NITs.It depends upon the rank of an individual.If you want one of the best NITs then the cutoff will be less like within 15000-20000.But if you go for some other GFTIs or NITs then the cutoff rank will be higher like within 30000-40000.So it solely depend upon the rank. 

Hope it helps.Thank you.

Hello! 

Please specify the college who's cutoff you're asking for as they vary from college to college. Please comment below this answer so that I can help you to know the cut off for civil branch of the college of your choice and in case of any further queries. 

Good luck!