Hi Sumit, JNU entrance exam For MA economics comprising of 100 marks with negative marking. 

Questions they ask such as micro and macro economics, maths and statistics,  International trade and some related disciplines such as public economics and economic development.

For further detail, you can go through this link :

https://exams.collegedunia.com/jnuee/exam-pattern

Gud Luck

Hey, entrance examinations for JNU were conducted early this year. They usually happen around May or June but for 2018 session, the entrances were conducted in December 2017.