M.A

Yes, you can go for MA in psychology after doing BA in any discipline.

You can consider following colleges:
Banaras Hindu University
Delhi Degree College
Ambition Point Academy West Bengal
IGNOU
GD Goenka University
Amity University

Hi Biplab,
You are eligible to apply for NET or SET exam as you have quota.

Refer the link for the same: https://admissions.jnu.ac.in/searchquestionpaper.aspx. You can also buy Arihant books for previous year papers.

The fees for MA in Hindi is INR. 609 and room rent for single seated hostel INR 480. Room rent for double seated hostel INR 240.

Request you to please refer the link for all the details: http://www.mountcarmelcollegeblr.co.in/images/Department/Economics/Ma_Economics_prospectus.pdf

Sorry, for this year the admissions are closed. You can try for admission next year.

There are lot of job options after M.A. Economics given that you do it from a reputed institute like DSE, ISI, IGIDR etc. Data Analytics (Genpact, DunnHumby, Fractal etc.)
Banking (ICICI, Citi, American Express etc.)
Indian Economic services
Public Sector units such as TERI, FICCI, NCAER, RBI etc. Teaching & Research
MPhil / PhD
Take NET exam and become a lecturer in college
Do a B.Ed and become a school teacher.

No, in UNOM, it is not possible through regular mode. In website, information is available about the eligibility for all PG courses conducted by UNOM.