Exam pattern for Political science PG ckurse with its syllabus shared below. 

https://university.careers360.com/articles/jnu-exam-pattern

You should start preparation from relevant notes and take short revision pointers for reference . Analysis of exam patteen and studying according to it is important. 

Practice as many mocks as you can and set time table so you have ample time to scrutinize mistakes and focus on weak sections .