Hello,
The basic eligibility criteria for admissions into NITs is that Candidates should have obtained a minimum of 75% marks in class 12 or equivalent exam or they must be in the top 20 percentile in their class 12 examination. For SC/ ST, theeligibilityis to obtain a minimum of 65% marks in class 12 or equivalent.

So as you have obtained an aggregate of 80%. You can get admission into NITs. Also you need to satisfy the cutoff marks for getting admission into NITs
Here's a link for NIT cutoffs for JEE mains
https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/jee-main-cutoff/amp&ved=2ahUKEwiG0OmM1afqAhWSaCsKHeOhC74QFjALegQIAxAB&usg=AOvVaw0ay0p7xaI0Sc82xeEH0ED5&ampcf=1
Hope it helps

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