jee Mains cut off for Gen is 89.75 percentile this year
Actually, it's the qualfying marks which indicates that you are qualified/passed JEE main and also it's a qualifying marks for being eligible for JEE Advance.
But, if you to get into some NIT/IIIT then you cannot be eligible only scored qualfying marks in jEE mains.
For NITs/IIITs you need to score better.
JEE Main 2020 College Predictor
Know your college admission chances based on your JEE Main Percentile
As per this year cutoff for jee mains 2019 for general category is 89.754 percentile respectively.