Hello student help me with your home state/ preferable place where you want to take admission so that I can provide you exact information.
Some of the top colleges and institutes which provide admission to B.Sc. Math Honours are as follows:

Jawaharlal Nehru Rajkeeya Mahavidyalaya, Port Blair
Jawaharlal Nehru College, East Siang
Ramjas College, New Delhi
Indraprastha College for Women, Delhi
Hans Raj College, New Delhi
The average tuition fee charged for the course in India ranges between INR 5,000 and 2 Lacs for a span of 3 years.

B.Sc. Math Honours is an undergraduate Mathematics degree program. Mathematics is the branch of structure, space, quantity, and change. B.Sc. Math Honours course provides in-depth knowledge about trigonometry, geometry, calculus and numerous other theories in Mathematics or respective disciplines, for example, computer science or statistics additionally to study of the normal Bachelor of Science subjects such as Physics and Chemistry
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Good luck