Hello

You can refer to the previous year syllabus of entrance exam of M.A Political Science for reference-

https://admissions.jnu.ac.in/Prospectus/JNUEE/SSS%201.pdf

However, it should be noted that this year there is a change in the entrance exam process. Examination will be conducted in MCQ format and prospectus for admission to the academic year 2019-20 has not yet released. So you should wait for further updates by the University.
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https://admissions.jnu.ac.in/Pdf/Revised%20Admissions%20Notice_DG_Nov%2011,%202018.pdf

Good Luck!