Ans. No, not always. Yes, you must focus on one of the subjects for the main examinations, but it does not imply you may do less work with others. This exam determines how prepared you are to join the Indian government system and how much you know about it in its totality. In the UPSC test preparation community, there is a well-known phrase that 'you don’t have to know everything about one thing, but you do have to know something about everything.'