hlwo Aspirant

hope you are doing well

sorry to say but the percentage you have in mains in not capable to help you in taking admission in any NIT in cs and ece.

you have to score atleast 88% in jee then you are able to take admission in nit for ece and if you want to take admission in cs then you have to score atleast 95% then you will get cs.

assuming you are from general category then this  percentage is must to get you in nit.

so be determined and study hard try to get atleast 80 percentile only then you will get top NITs.

hope this is helpful for you

best of luck