Dear,

Most institutes and universities offering this course in India follow a merit-based admission process. However, in cases of some institutes, admission to the course is made on the basis of your performance in entrance exam. Students in such cases are shortlisted based on both academic record and performance in a relevant national, State, or university-level entrance test. If you want to apply online for this course , I would recommend visiting the college website where you are taking this course. These are some universities with their admission process.

https://university.careers360.com/colleges/list-of-ba(hons)-in-political-science-universities-in-india

Hope this helps!