Hello Vasu,

At IIIT, there are no category barriers. Whether you are an OBC or not, you should get the same cutoff marks as of a general candidate. There is no concept of different cutoffs for different categories. 

Selection is based on marks cut off and the marks cut off varies every year. Last year the cut off marks for CSE was 287 and for ECE was 270.

It is tough to get this with this rank. However, you may get IIIT's like Kota, Una, etc. But top-notch IIIT's like Hyderabad is difficult perhaps impossible.

Good luck!