The UPSC prelims syllabus includes General Studies subjects like History, Geography, Polity, Economy, Environment, and Current Affairs, with a focus on objective-type questions. In contrast, the mains syllabus expands into deeper analysis, requiring candidates to write descriptive answers on the same subjects along with optional subjects chosen by the aspirants. The mains also include papers on Ethics, Integrity, and Aptitude, along with a compulsory essay paper. The distinct approach to assessment in prelims versus mains necessitates targeted preparation strategies for aspirants.