Hello Shahnawaz,

It is hard to say that you can get an IIT or not, as it depends on your AIR. If you have an AIR less than 600, then there is a chance you might get into NIT.

The GATE marks that you score in that three hour exam. This depends on the difficulty level of the question paper.

Eg. 48 marks in GATE 2012 may be equivalent to 35 makrs in GATE 2013.

So your selection in IIT depends on your All india Rank.

Hope this will help.

Thanks