Dear Aspirant, the cut off marks for of jee advanced is changing in every year so it can not be marked that what is the cut off marks for this examination. And every nit and iit has their own marks to join that college. 

Thank you. Best of luck. 

Hey there for getting admission into NIT you need to score very good marks in JEE MAINS that is your percentile is above 98.5 and moreover for IIT you need to clear Advance and you need rank of 5000 for taking admission in Good IIT even computer Science stream are closed at 2500 rank in JEE ADVANCE only.

Hope it will help you