M.A

Yes, you can anywhere from any University.

Top colleges for M.A. HR in India are TISS, Madras college of Social Work, St Xavier college Mumbai, Jamia New Delhi, There are few good colleges across India offering M.A. In HR as most offer it in M.A. Mode. In Bangalore, there are not much colleges offering HRM in M.A. Mode. Few of them are Shristi Arts college, Jayanti College.

Yes, you can. It does not matter if you show your previous M.A. You can also explore on MSW Ph.D. MBA HRM, PGDM Industrial relation, etc.

You don't need to reapply, wait for somedays. University will upload the list of eligible candidates for the entrance examination. They will update their announcement sites after the closing date of online admissions. Make sure that you have completed your online application form properly or if you haven't then you can resubmit the form. For more details refer to the university website.

The last date for MSc admissions is extended up to 11 Dec 2020. You will also need to submit the hard copies to the university within 3 days from the closing date of the online admissions. For the selection process, you have to sit for the entrance exam and after the declaration of the result, qualified students will sit for group discussion, and then the final stage will be an interview. For more details refer to the university website: https://www.nehu.ac.in/
keep checking the announcement section of the university for updates.
REGARDS!