Since you did not mention the exam you took so preassuming  it to be jee, three NITs, there's a fair chance of getting NIT Rourkela (Probably a dual degree or an integrated M Sc.).
In the top 10-15, a chance of getting Biotechnology or textile or production is possible.

Also, if you have a category rank of 30000, I'm not sure if you can expect anything. I'm talking about AIR 30000 and OC
A good branch in the North eastern NITs or in the NIT in your home state(If you're from Telangana, then god save you) can be expected. And maybe andhra Pradesh's new NIT too. Watch out for that.

Good luck!