Hey Sanchita.

Here is a list of various government institutes that offer the course of BA in defence and Strategic studies. The mode of admission to each course is different there is no combined entrance test, you can look at the official websites of each university for details.

North Maharashtra University

Punjabi University, Patiala

Rajasthan  Maharaja Ganga Singh University

Thiruvalluvar University

Bharathiar University

University Of Allahabad

Chatrapati Sahuji Maharaj Kanpur University

Mahatma Gandhi Kashi Vidyapeeth