Colleges in Rohtak

The fees varies from college to college and you will need to check the website of the particular college for the fee structure information.

Check the university’s website.

I think you should visit the university or college website. There you will get accurate and every information you wish to seek.

Here you get complete information about eligibility for MA in political science in MDU
https://www.shiksha.com/humanities-social-sciences/political-science/course/m-a-in-political-science-maharshi-dayanand-university-rohtak-270954

No, you don't have to do D.Pharm for doing B.Pharm. Eligibility for B.Pharm in MDU is that a candidate must have passed 10+2 with Physics and Chemistry as compulsory subjects along with any one of the subjects from Mathematics /Biology /Biotechnology/Computer Science from a recognized board.

You need to have 45% in 12th to take admission for BA.

Yes, to take admission in B.Pharmacy, you need to give the entrance examination.