I've recently completed my BSc. Economics from LUMS and aspiring to give the CSS exam in 2020. I have no background in history, and have not studied it formally as a subject since high school. I am however very interested in the discipline of history and am considering to take up either US History, Indo-Pak History, or Islamic History as an optional subject. Would I be advised against this given my background? And will taking indo-Pak/Islamic history compliment the compulsory subjects?