What should I keep in mind while choosing an optional subject?
Two things must be kept in mind: 1. Your comfort level with the subject & 2. Kind of guidance and material available It is not mandatory that your optional subject should be from your stream. The most commonly chosen subjects are Sociology, History, Psychology, Geography and Public Administration. If you are too good at your own subject and can easily solve the paper on the same subject asked by UPSC then you should definitely have it as optional subject. But if you are not able to solve then you should switch on to some other subject (preferably from the above mentioned subjects)