Hey,
Bachelor of science in Mathematics is an undergraduate programme that is designed to equip the students with in depth information of Mathematics and related disciplines such as computer Science or Statistics.It is generally a three year programme. Minimum eligibility is to pass 12th from any recognised board.
B.Sc in Mathematics focuses mainly on developing mathematical skills in algebra,calculus and data analysis. You can pursue Masters of Science in Mathematics after this or Masters of Science in Information Technology.
Some of the colleges that offer this course are:
Loyola College,Chennai
Fergusson College
University of Delhi
Stella Maris College,Bangalore
Patna University
Hope this helps.
Good luck.