Hi Niki,
MATHS is not at all compulsory for admission to IISc. There ars separate departments in Chemistry , Physics , Biology , Maths etc,. - who offer inter departmental programs as well as individual courses by parent departments.
And Math will come in your syllabus or not totally depends on which degree you want to pursue here. Like for Bsc you need to give KVPY which has maths in it, if you come here for masters in biological science you donot require core maths subject. But for any research knowing maths is essential so I would advice you to pursue atleast basic mathematics.
Hope this will help,please feel free to ask if you have nay further queries.
Thank you.
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