Dear candidate,

At first lots of  congratulations for your results . According to trends of previous years and this year's JEE MAIN cut off I am afraid to inform you that your chances of getting admission government colleges NIT's and IIT's are almost negative despite of OBC category . Judging by previous year's cut off some of particular departments of particular NITs you can get are

NIT Bhopal

Metallurgical and Material Engineering

NIT Jaipur Civil engineering

Metallurgical and material engineering

NIT allahabad

biotechnology

By OBC you can get some NITs based on home state domicile.

some of  those NITs are

NIT calicut

chemical engineering

civil engineering

metallurgical and material engineering

NIT Delhi

electronics and communication engineering

NIT tiruchirapalli

Metallurgical engineering

production engineering

You can further check here

https://engineering.careers360.com/articles/jee-main-cutoff-for-top-nits

Predict your chances here

Best Wishes