Humanities & Social Sciences

Refer Wren and Martin for English Grammar.

This link is suggested by Shiksha for best colleges under ranking and other considerations. Please refer this link to know the best colleges in India for BA in Political Science.
BA in Political Science colleges in India.
https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/humanities-social-sciences/political-science/colleges/b-a-colleges-india&ved=2ahUKEwjLtLChx4LZAhVMOI8KHa4TAdMQFjAAegQIBxAB&usg=AOvVaw3AbmiEPNWmAe0rt7nZspMh.

Hi, mass communication in a broader spectrum involves social Science that is related to environmental studies. However, if you do major in mass comm. Then you can pick environmental studies as a pass subject. However, you have to screen colleges as you know not every college will provide you all sort of combination.

Not listed in DEB approval list.

This all depends on the eligibility criteria of the university in which you want to enroll.
You should check the eligibility criteria of the university.

Now it would not be possible to change the stream. You need to continue with you BA and go for higher studies in the same stream.