Which are the top colleges for M.Sc mathematics?

The best universities which offer M.Sc in mathematics are: IISc, IMSc, IITs, CMI, ISI, TIFR, K. J. Somaiya College of Engineering, Lovely Professional University, Punjab, Birla Institute of Technology and Science, Pilani-Pilani, Rajasthan, College of Engineering-Pune, Maharashtra. Birla Institute of

IIT-Bombay is the best college and after this, there are IISERs. You can also consider IISc for M.Sc in Mathematics. The admission to these institutes is not direct or interview based, you'd need to crack IIT JAM exam first for this.