M.A

The Master of economics is a postgraduate Master's degree in economics comprising training in economic theory, econometrics or applied economics.
I won't suggest you to pursue it along with M.Tech because both these courses are too tough to be done together. Either do M.Tech or MA.
Below mentioned are the top colleges of pursuing MA are:
1. Indian Statistical Institute - Kolkata / Delhi
2. Delhi School of Economics – Delhi.
3. Indira Gandhi Institute of Development Research – Mumbai.
4. Madras School of Economics – Madras.
5. Gokhale Institute of Politics and Economics – Pune.
6. UPES – Dehradun.

MA in economics will not be difficult for you. You should definitely go for it.
Below mentioned are the top colleges to pursue MA in economics are:
1. Indian Statistical Institute - Kolkata / Delhi.
2. Delhi School of Economics – Delhi.
3. Indira Gandhi Institute of Development Research – Mumbai.
4. Madras School of Economics – Madras.
5. Gokhale Institute of Politics and Economics - Pune
6. UPES – Dehradun.

Yes, it will be good for you to pursue MA English from DU for your future prospective.
All the best.

You can prepare for the CSIR net.

You have opted for B.Com in the UG, then opt for M.Com. Otherwise, you should pursue MBA. Try to finish the course which you have started.

Yes, you can. After completing graduation in any subject, you become eligible for MA English. But, in most of the university you have to appear for entrance test. In some universities, they give extra points to the students who study English at graduation level.