Distance

I don't advice you for distance learning. However, you may check with Amity University for the same.

You have not mentioned the duration of diploma course. But, a degree course in distance mode with a certification course/diploma undertaken simultaneously is valid.

The distance mode MBA which are approved by UGC & DEC are offered by JNU.ac.in, Symbiosis and smude.edu.in (Sikkim Manipal University). These courses are not costly. You may visit their website and chat with on-line counselor for all the details of admission, fees, study material, etc.

One cannot become a poet or writer in short doses of education. It comes from natural talent of expressing your feelings. Wide reading, writing and exploring; hones the skill of expressing feelings and emotions into poetry or a novel.
My suggestion is to pursue BA in English literature and follow it up with MA-English literature. It will give you dual advantage of career and creativity.

You have scored less in your graduation to get admission in full time MBA. You can go for distance/correspondence MBA.
Narsee Monji Institute of Management Studies
School for Continuing Education
Sikkim Manipal University Directorate of Distance Education
ICFAI University and IGNOU among others.

You can either pursue a MBA in Energy management or pursue M.Tech followed by a P.hD in renewable energy.
Since, renewable energy is a new field, I am not sure if a correspondence MBA program with that specialization available in India
Internationally a lot of options are available in the said area.

It depends on the level of your confidence. Many problems may arise and you may get a number of doubts. So, languages must be learnt with all kinds of material. Spoken language is the most important part. Plan for it too.

Check the link:
https://engineering.shiksha.com/engineering-courses-in-delhi-ncr-ctpg