M.Phil

You can take admission in M.Phil social work after you complete your Ph.D. in Anthropology. Simultaneous courses are not allowed.

You have already done masters, so try to go for PhD.

You should go for Ph.D. as Ph.Ds have a bright future in this profession.

Yes, it is possible. Go for the Ph.D. Almost all major universities and colleges offer Ph.D.

In the field of law, higher studies are mostly beneficial if one wants to pursue academics. For anything else, like litigation or joining a corporate firm, etc. , it is advisable to start as early as possible as the field of law is very pragmatic and dynamic and practical exposure is the most important factor when it comes to growth. However, if your interest lies in teaching, policy making, etc. , you can opt for higher studies.