JNU has two schools that offer post graduation in Economics: School of Social Sciences (SSS) and School of International Studies (SIS). SSS has MA in Economics which is open to students from all streams. However, only graduates in Economics are eligible to apply for MA Economics with specialization in World Economicy offered by SIS.
SSS (MA Economics)
To crack JNU entrance, solving past years is extremely important. They essentially have the same trend of questions being followed over years. If you are preparing for ISI and DSE entrances, clearing JNU may not be that challenging. SSS entrance tests on basics and do not really focus on any sophisticated problems like ISI and DSE. Last year SSS entrance had objective as well as subjective questions.