B.Com

Yes, you can apply to most of the government jobs. All the banking opportunities are open as you have done your education in finance.
You may also apply to oil and gas companies.
Generally, these companies do not recruit through walk-ins and have national level tests followed by an interview.
All the

Firstly, I would like to tell you why you want to drop because B.Com is not a high degree so with B.Com you can do company secretary and concentrate more on company secretary because a good portion of B.Com depends upon the syllabus of Company Secretary course so my suggestion is that continue your

General eligibility is that a candidate should hold a degree from any of the recognised universities or must have an equivalent qualification so any graduate can appear for this exam.

You have to complete 10+2 with 50% marks. But, sometimes with below 50% marks, you may get opportunities, if seats are available.

Yes, you are eligible to work as a medical representative. A medical representative require minimum graduation from any stream. Although science graduate is more preferable.

What is the eligibility criteria for DU admissions 2017
DU eligibility criteria are the norms, regulations or conditions, which candidates seeking admissions to any programme need to fulfill. The DU admissions 2017 eligibility criteria includes academic qualification, age limitation, qualifying marks

You can do B.Ed, as you have secured 55% marks in graduation. For B.Ed, minimum 50% is required.