Hey,

https://university.careers360.com/articles/jnu-admission

Refer to the link given above for detailed information regarding your admission into the foreign courses offered by JNU.

The summary version,

JNU conducts it's own entrance exam through which it provides admission to students into various different courses. The general pattern of the exam consists of questions from General awareness, Quantitative aptitude, Reasoning and related subjects.

You need to fill the form and sit for the exam. If you passed the cut off then you will be given admission in that course.

Hope that helps.

Thank you.