If you have moderate rank in GATE then you are highly probable to get seats in NITs. For different subjects the rank criterion are different. But if you wish to get admitted in the NIT then you need to score not as high as IIT's but some moderate rank corresponding to your subject.

To know more about the GATE cutoffs visit the link below:

https://engineering.careers360.com/articles/gate-cutoff

I hope this answer helps. All the very best for your future endeavors!