Hii,i am here to help you according to your query.The syllabus for Entrance Examination for Masters in History of JNU is as follows:

General Comprehension

A broad understanding of the Social sciences

Themes related to political, economic and social history and on aspects of religion and culture pertaining to Indian and World history for the ancient, medieval, modern and contemporary periods

Besides it, Previous Years Question Papers which are subjective in nature might be helpful to you to understand the crucial topics of History till date. Extract the important topics from question papers and study them through important.

Hope,this information helpful for you.Goodluck.