Hey Shouvik,

Many many congratulations you have scored well,

Since Closing rank for M.Sc.in Physics for IIT Kharagpur was 582 Previous year in OBC Category so there are very high possibilities that you can get IIT KGP for your masters in Physics.

You can find these details by following link - 

http://jam.iitd.ac.in/PDFs/R3.pdf

All The Best.