I need help in selecting optional subject for CSS 2020. I am graduate of B.E ( Mechanical). I don't have any knowledge of social sciences. Kindly guide me in this regards. My few combination of subjected are following from which I have to choose one :
Combination 1)
Physics
International Relations
International Law
History of USA
Combination 2)
Physics
Sociology
Gender studies
Criminology
History of USA
Thanks in advance.