B.Com

Here is the link:
http://mbadiscussions.com/eligibility-mba-after-scoring-less-than-40%-marks-graduation-215183.html

Kindly follow the link:
http://m.indiaeducation.net/careercenter/10-and-12/difference-between-bcom-and-bcom-hons.aspx

You can do MBA or CA and CS.You can also give exams like CAT,etc.

As of now in the society, there is a huge demand for the people from finance and marketing domain. Even HR and accounts are also important but there is so much growth in marketing domain and finance sector.Plan according to your interest and take a wise decision because you are also planning for MBA which plays as a post graduation in your career.Since you are from business background think practically and analyse the scenario from present and plan the future.
All the best!

No way, you need to study for another 3 years if you want a B.A Degree.

Bachelor of commerce is an under graduate program in business domain. So it is better to look for jobs in business field in which you are interested. There are so many branches under business you have choices to choose. Finance, Business analyst, Accounts and investment domain etc you can find good opportunities. There are so many openings for B.Com completed people who are looking for jobs and you can find them if you search in internet for jobs in different jobs providing websites.
I hope the information I gave will help you and if you are having any query just ping back!

Try for a job first. Then, think of adding to your CV. It is a long-drawn process. You have to work all through for viewing a growth.