B.Com

Yes, you can definitely apply for B.Com with 56 marks in accounts.

No, it isn't compulsory. Yes, you need to have maths as a subject of study in class 12th and you should pass in the same. But while calculating the percentage for admission purpose, English plus top three subjects (marks wise) are considered.

It is slightly difficult for you to get admission in DU colleges, but don't lose hope.
I hope you get admission.

Check the below list:
Poornima University
Amity University, Jaipur
Global Centre For Entrepreneurship and Commerce
Vivekananda Global University
JECRC University
Biyani College of Science and Management
Poddar Group of Institutions
Jaipur National University
Mahatma Jyoti Rao Phoole University
Banasthali Vidyapith
Manipal University
The IIS University
Maharaj Vinayak Global University.

U are eligible for admission. It is a good rank. Hope for the best

You can do M.Com or MBA to get better career prospects.

If u have quota then u have chance to get admission in du college otherwise there are many other college like
JNU
GGSIPU
ASUS
JMI

Hi,
You'll surely get admission, don't worry, but the colleges may not be that good.
Keep trying.

https://www.shiksha.com/animation/2d-3d-animation/course/m-sc-in-visual-communication-loyola-college-lc-chennai-nungambakkam-109010
Please go to the link that I am sharing here to know about this.
Good luck.

Some best colleges for B.Com are listed below do check
Shri Ram College of Commerce - [SRCC]
Lady Shri Ram College for Women - [LSR]
IIFA Multimedia
St. Xavier's College
Christ University
Hindu College.