I have a friend who did his master’s from JNU and he was able to give some insight regarding the entrance test for MA Sociology. 

In the entrance examination, there will be questions from out of the syllabus. You may be asked to give a sociological interpretation of the current situation, event, etc. So, stay updated with contemporary social issues. Here is a list of sections from where you can expect questions.

• Sociological Thought: Marx, Durkheim. Weber, Parsons, Spencer, Comte, etc.
• Research Methodology and techniques
• Indian Society: Poverty, Family, Kinship, etc.
• Society and polity
• Society and economy
• Technology
• Caste and class system
• Concepts like Globalization, Modernization, Sanskritization, and Localization.

Go through the list of topics assisted to you and make sure you prepare them thoroughly. As you can see the majority of the questions are from the syllabus itself.