Hi Ajay, this year jee-main expected cutoff will be >=80(Gen).if your expected marks are 90 then you clear the entrance test and qualify for jee-advance paper but your rank would be less and with this marks you not get admission in NIT.

don't lose hope, you have second chance to prove yourself that is jee-advance paper.

for more info you can go to this given link :
https://engineering.careers360.com/articles/jee-main-cutoff

good luck