Hello mustak

The tip is simple and straight start covering the entire syllabus of what you have studies in graduation in political science which includes

• Constitution
• Western and Indian political thinkers
• Political structure of India
• Public relations
• Political structure of other countries

You can also get a book for preparation like R. Gupta's. 

To know about more details you can visit https://www.careers360.com/university/jamia-millia-islamia-new-delhi/ma-political-science-course