M.Com

Hello Rachit, in most if the cases PGDM is equivalent to MBA. So what you do is immaterial. However try to get admission in college of high repute like IIMs or XLRI, etc. This only will fetch you good job opportunities.

You can not pursue two course in regular mode from the same university.

Hello,
If you are interested to get a job in banking sector, then yes, you are eligible to apply for bank exams because the eligibility required to apply in most of bank exams is graduation.
You can apply for IBPS PO or IBPS Clerk, IBPS RRB, SBI PO, etc.
You can check the below mentioned links:
https://ask.shiksha.com/how-can-i-become-a-banker-qna-3968900
https://ask.shiksha.com/which-short-term-course-should-i-pursue-to-get-a-good-job-in-the-private-banking-sector-qna-3881640
I hope it helps.

Yes, you can pursue MBA. In order to pursue MBA, you need to be a graduate (any stream).

MBA is a better option and having great industry exposure. You might have to pay more for MBA and less for M.Com, but after the completion of MBA and M.Com, the ROI for MBA will be more.
Thank you.