Political Science

DU and BHU have the best colleges for this, also, in case you stand eligible you can apply for JNU. It depends on the cut off of the colleges.

The NAAC A+ graded colleges are: https://goo.gl/mPTbcV

Yes for preparation of civil services, it would be beneficial. But you continue with commerce that would be more beneficial for you.
Good luck.

Hi Deepak,
After completing your majors in arts, there are many options which you can pursue. You can sit for competitive exams like CDS, CPF, UPSC Civil Services, SSC-CGL, Bank PO and many others to get into government services. In private sector, a lot of career opportunities can open if you could

Please specify the location, the famous ones are DU, BHU, etc.

You need to apply in DU for PG course.
Good luck.