M.Com

You have to clear ugc net exam to pursue phd. For further details, I am a sharing link: https://www.shiksha.com/university/gndu-guru-nanak-dev-university-amritsar-24108

Hi
JNU does not offer M.Com programme. But you can pursue MA economics
CITD MA. A new and unique Master's programme (M.A. ) in Economics was introduced by the department in 1995/96. The programme provides sound theoretical background in the principles of economics and equips students with analytical tools and techniques for understanding the evolution of the world economy.

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https://www.shiksha.com/college-predictor

Please check that directly with the university. Yes many courses are approved but there are some that's not approved.

Yes, you can pursue B. Ed as you have teaching experience but first of all please check the eligibility criteria.

You must have the thorough knowledge of that graduation and last year's.

You can join corporate sector or you can go for UPSC.

You can apply online for distance education for M.Com.

Both are good options. But, analyse your capabilities before deciding what to choose, CA might not be really that easy compared to M.Com. So it would depend on your self confidence.

Both are good options based on what you have given above. The later from reputed institutions is also a good option.