Here is the list of Top Science Colleges in India for those who wish to pursue graduation in Science.

St. Xaviers College- Kolkata
Loyola College
Presidency College
Madras Christian College
St. Xaviers College- Ahmedabad
St. Stephens College
Fergusson College
Christ College- Bangalore
St Xavier's College, Mumbai

You may wish to add any college which you feel deserves to be in this list.