CBSE

Hi Ankita,
Please see the seat reservation at St Xavier College and related information here http://xaviers.edu/main/index.php/bcomintroduction

1. Indian Institute of Science, Bangalore,
2. Indian Institute of Technology Bombay,
3. University of Delhi,
4. Banaras Hindu University,
5. Indian Institute of Technology Kanpur.

Mentioned below is admission brochure, please go through the same:
https://www.ravenshawuniversity.ac.in/admission_2018/admission_brochure4.PDF.

Dear Warish,
The eligibility criteria for admission in BCA is passed in 10+2 examination recognized by a Board / University / 3 years professional diploma programme of HSBTE equivalent with at least 45% marks. You can apply directly for the admission on the basis of your 12th percentage.

Maths Hons. and other B.Sc. courses are offered on merit basis only. The entrance exams in DU are for the following courses:
BBE
BMS
BFIA
B.Tech ( Information technology and Mathematical innovation)
Bachelors of elementary education
B.A. (Hons) humanities and social science
B.A. ( Hons) multimedia and mass communication.

You can continue pursuing your 12th in commerce & along with it, you can join a diploma course with a private institute in animation/software & sharpen your skills. In case you do well, you can always pursue further education in the said area.
Now a days, a lot of private institutes also offer Graduation/Masters programme in Animation and Software areas.

Please go through the cut-off list of the previous years which I have attached here. You'd know everything there is to know:
https://www.shiksha.com/humanities-social-sciences/articles/du-cut-off-trends-for-past-years-blogId-12697