The exact syllabus for JNU is not fixed but the following topics are Important and the question will revolve around this Topic.

• Political Theory and Thought 
• Comparative Politics and Political Analysis
• Indian Government and Politics
• Bureaucracy and Public Administration
• International Relations

Securing a seat In JNU International Relations is very difficult and this is the most Popular course at JNU. Apart from knowledge, You must have good writing skills because the questions will be subjective in Nature. 

There will be total seven question of which You need to answer any three for 100 Marks in Three hours.

You can see the previous years paper at the following link;

https://admissions.jnu.ac.in/searchquestionpaper.aspx

You can read more about How to prepare for the Entrance exam at the following link:

https://learningskillsindia.com/pg-entrance/jnu-ma-political-science-entrance