B.Com Scope

If you are from Mumbai, you may opt M.Com E commerce which is a mixed role of IT and commerce. you may initially work in accounts and finance for 2-3 years and then you may learn SAP FICO, once you complete SAP certification, you may get employment as a SAP consultant whose major role will be implementing and customising SAP for Finance module.
If you have studied mathematics at 10+2 level, you may go for MCA, but that may not help a lot in IT job unless you do it from a very reputed institute,
You can study abroad only if your degree is of 4 years duration. Otherwise, you have to study M.Com from here and you can apply.
Your question is very basic- What should I do? Rather, you should ask yourself- what is your passion, what you really want to do. There can be two theories such as passion and job to be kept separate and should go parallel or both should be combined. Well, it depends. if you have enough time and patience to wait very long, then you should pursue your passion. There is always difference between a passion, aptitude and like. I may like song a lot, even I may like to sing, but singing is not my passion so I am an extremely bad singer. Decide about it.
Id you are more focussed on getting job and money instantly, so the earning right now, you should focus on what you really like- accounting, BPO, selling, something else and start making your career in that particular field. You may take help of of a good counsellor and a person doing psychometric test such as career aptitude test. There is opportunity for everyone who wants to grab it.

A commerce graduate has ample scope of exploring various career opportunities after completion of graduation.
M. Com:
The most ideal option for a student who completes B. Com is post graduation in commerce. There are a sea of job opportunities after completion of M. Com. Some of the options which one can think of pursuing after completion of M. Com are as below:
Civil Services examination:
Appearing for civil services examination become lot easier which doing your M. Com as you can work with a lot of dedication. You can start preparing for preliminary and the mains examination. The period of two years of M.Com could be effectively utilized towards the preparation of these examinations.
Job in banking sector:
IBPS (Institute of Banking Personnel Selection) conducts regular examinations known as CWE the score of which is used by various banks for selection of persons for various posts. Banks now-a-days don't conduct separate exams for selection of candidates for their vacancies. Hence the score of the CWE is becoming increasingly relevant these days. You can utilize the period of your post graduation for preparation of CWE.
If you have good communication skills, have a charismatic personality, and are dependable and confident, MBA with HR specialisation can help you launch a career in human resource development, industrial relations, and personnel management. HR is not only about common-sense. You have to have specific skills and aptitude for the job. HR personnel are the first points of interaction between a company and its employees and an efficient Human Resources department plays a critical role in keeping business operations smooth and effective.
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All the Best!