Dear candidate here's the list of some of the best colleges for studying ECONOMICS :-

• St. Stephens College.
• Lady Shri Ram College. Lady Shree Ram College is a college for women located in South Delhi. ...
• Miranda House.
• St. Xavier’s College, Kolkata
• Loyola College, Chennai.
• Christ University, Bangalore.
• Presidency University, Kolkata.
• Madras Christian College, Chennai.

Since maths is also a subject which is taught in Economics hons so indeed these colleges are best for these subjects.

All the best

Hope this helps