Hello there!

Firstly understand the syllabus and exam pattern of jnu ma political science like

1. Political Theory and Thought
2. Comparative Politics and Political Analysis
3. Indian Government and Politics
4. Bureaucracy and Public Administration
5. International Relations

Then update your general knowledge and current affairs,study post colonial and contemporary political affairs, pay more attention to context of india, work on your writing skills and practice more and more previous years papers.

Thank you.