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