I get 246235 rank in JEE main 2020 Can I get any NIT or IIIT college

Hello, as you have not mentioned your category so I am assuming you to be in general category and at this rank your chances of getting any Nit, IIIT looks not possible.
Because cutoffs of these colleges are very high.
Even cutoffs changes every year but Nit, IIIT are government colleges and are top colleges of India.

You can apply for Csab counseling which takes place after Jossa counseling.
I would recommend you to apply for other states government and private colleges which takes admission through Jee mains marks.

Refer to this link it will help you

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

All the best.
Hope this will help you.