Hello Aspirant, hope you are doing good.

Firstly, congratulations for you rank in JEE Mains, you did great. Now, with your JEE Mains rank in OBC category, you have a good chance of getting into most of the top NITs , even with branches like Computer Science. Although cutoffs change every year, based on a lot of factors, you can still be hopeful of getting a seat in most of the NITs. I'll list down some of them for you:

1.NIT Tiruchirapalli (NIT Trichy)

2.NIT Rourkela

3. NIT Surathkal

4. NIT Warangal

If you want to know the list of all the colleges that you can get into with your jee mains rank, you can get it here:

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

Hope this helps you. Good Luck!