Subjects perceived as challenging for UPSC aspirants often include Geography, Polity, and Public Administration. Geography is often intricate due to its vast content and interlinkages with current affairs and environmental studies. Polity is complex because of the need to understand extensive legal frameworks and their historical contexts. Public Administration involves grasping theories and practices, requiring a blend of conceptual and application-based knowledge. While these subjects are tough, they are also rewarding, as they are vital in the examination's syllabus and significantly impact overall scores.