Hello Dear ,
Absolutely you get admission in nit and IIIT on the basis of jee main score.
But it's depend on the cutoff of colleges.
To take admission in NIT's and IIIT's JOSSA counselling is mandatory.without JOSSA counselling you don't get admission in college and JOSSA counselling is started from 6 Oct 2020 .Go with JOSSA counselling and firstly fill those colleges in which you think to take admission.

Here is the JEE main college predictor link :
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Thank you
I hope this is helpful for you.

IIIT Bangalore

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