I see that you have got AIR 1533 and 533 OBC category rank in NIMCET. Well if I see previous year closing rank for different colleges then with rank of 533 in OBC category it will be quite hard for you to get a seat in nit Surathkal. Well I think that you will not get a seat in nit Surathkal. But you might get a seat in nit Calicut and others. 

All the best.

Thank you.