Hello,

You have to get in through one of these competitive exams:

KVPY: If you have a rank below 300250 in SA or SX stream, then you can get admission in IISc for UG.

JEE Advanced: If you get around the good score in advance, you can get admission.

NEET: If you get a rank under 300, you can get admission. (However, when it was AIPMT, the cutoff rank was 600)

So as you can see, it is very difficult through JEE and NEET so KVPY is your best bet. Maths is not compulsory, but you will have maths courses in college.

All the best!!