Admission to the BSc Courses are mostly through 10+2 score and some of the top universities provides admission on the basis of entrance. If you are up for entrances, then you can get any based on your examination. But if you want to take admission on the basis of 10+2 score, then it would be wiser for you to apply for the state Government colleges as well as other colleges under state university. In some of this colleges you will be able to get a seat.

As you didn't mentioned your state, we can provide you any suggestions of college names. Although you can search out the colleges in your state by visiting the link below:

https://university.careers360.com/colleges/list-of-bsc(hons)-in-mathematics-universities-in-india

I hope this helps. Wish you a great day!