Dear B Sumit

As you had mentioned your rank AIR 315 , then by looking into previous years cutoff for 

Control and computing specialization is 510 General.

OBC 459

SCST 340

So by seeing last year cutoff you should get admission into IIT Bombay.

For IIT Madras the General cutoff for control and instrumentation is 779

So you get a strong chance to get any of them with your, favourite specialization.

Congratulations IItian.