Atma Ram Sanatan Dharma College, University of Delhi

Ramanujam college is better than Atma Ram Sanatan Dharma College for B.Sc in Maths (H).

Go for Atma Ram Sanatam Dharma College. Nice crowd, upto the mark infra , go for it.

ARSD is a better college among the above colleges because faculty members of this college are very helpful and well educated.

Both the colleges are good but ARSD has better faculty than DDUC. So I would suggest you to go with ARSD.

ARSD is better option than Dyal Singh college because ARSD has better faculty for this course than Dyal Singh College.

No, it does not offer this course.
In DU, the only college that offer this course is, College of Vocational Studies.

Any post-graduation degree requires 50% marks in graduation, and you have 59% marks, so you can join for M.Com course, and whichever college you are choosing, just see their website, when is the application form available, so that either you can fill online or in person. Go and fill in that particular college and the documents will be required would be your graduation certificate, marksheets and transfer certificate.

The mandatory subjects are English and Hindi for honours student and three more subjects including honours subject and two subjects which you have to choose.
All the best.

Please see below comparison
https://www.shiksha.com/compare-colleges-51310-207039