Hii,

To get a seat in IIT through GATE qualifying mark is not possible.Irrespective of the academic marks, As you are from SC category you need to get minimum 60-70 marks to get the Top IIT's.

As you are getting qualifying marks your chances of getting NIT's is also low but you will get  private colleges which takes you through GATE score.

If you are serious about the Masters degree,Give another attempt for GATE exam and score good marks.

All the Best...,