M.Com

For which region are you asking for?

There are various colleges which offer this course through distance learning mode such as du, IGNOU, annamalai, Symbiosis Centre for Distance learning and many more. You can choose Du or IGNOU (are the best universities).

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.

Kindly visit this link
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.