Hansraj College, University of Delhi

There are a total of 92 seats for zoology in Delhi University out of which 46 are for general candidates.

Yes, of course it is only the board percentage which will be considered for the admission process. Apply online on DU official site and wait for the cut-off list.

You should go for mathematics (Hons.). Yes, BA in mathematics (Hons.) is available.
BA in maths (Hons.) is essentially equivalent to Bachelor of Science or Bachelor of Arts degree with a specialty in mathematics. Relatively, few institutions award Bachelor of Mathematics degrees, and the distinction between those, that do and those that award Page on B.Sc or BA degrees for mathematics is usually bureaucratic, rather than curriculum related. However, schools that offer Bachelor of Mathematics degrees argue for a separate degree, maintaining that the study of mathematics is vastly different from other fields.

Hello Gauri,
Please visit the official website of these colleges for admission related information. You can also visit:
https://www.shiksha.com/college/hindu-college-north-campus-delhi-23907 and
https://www.shiksha.com/college/hans-raj-college-kamla-nagar-delhi-3062