The UPSC Civil Services Main Examination typically includes the following subjects: Essay, General Studies (four papers), and Optional Subjects (two papers). The General Studies papers cover diverse topics, including Indian history, geography, polity, economy, environment, and current affairs. Candidates can choose their optional subjects based on their academic background or interests from a prescribed list. The structure is designed to comprehensively evaluate candidates' knowledge, analytical abilities, and problem-solving skills in areas relevant to public administration and governance.