The UPSC Preliminary Examination typically includes subjects such as General Studies, Current Affairs, and an optional subject. The General Studies paper covers various topics like History, Geography, Polity, Economics, and Environment. Additionally, candidates have the option to select one optional subject from a wide range of disciplines, which is evaluated in the Mains stage. Understanding the syllabus thoroughly is crucial for effective preparation, ensuring aspirants are well-acquainted with the areas of knowledge required for the examination.