Hello!Best colleges for BSc in Mathematics that you can consider for your admission are:

• St. Xavier's college, Mumbai
• Christ university, Banglore
• Loyola college, Chennai
• Indian Statistical Institute(ISI), Banglore
• The Chennai Mathematical Institute(CMI), Chennai
• Madras Christian College, Chennai
• Presidency college, Chennai
• Mount Carmel College, Banglore

Best colleges in  DU:

• Miranda house
• Hindu College
• Hans Raj college