Dear aspirant
At first lots of congratulations for your results .
I .According to trends of previous years and this year's JEE MAIN cut off I am happy to inform you that your chances of getting admission into colleges NITs and IIITs are very high .One thing is important that admission in OBC or any other category entirey depends upon that particular category rank , not the All India rank.

You will get easily many NITs in other states through JOSAA
you can check previous years cut off
https://engineering.careers360.com/articles/jee-main-cutoff-for-top-nits
check your chances here
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Best Wishes.