If your OBC rank is 15314 and your overall rank is 57699, then according to the past trends, the Indian Institute of Information Technologies that you might get admission in are:

IIIT Kalyani
IIIT Agartala
IIIT Sonipat
IIIT Bhagalpur
IIIT Una
IIIT Kota
IIIT Dharwad

You should apply to all of them and you will definitely get admission in one of them. All the best!