One of the most challenging subjects in UPSC preparation for many aspirants is General Studies Paper II (CSAT), especially for those from non-mathematical or non-engineering backgrounds. While it may appear to be just a qualifying paper, it includes sections like quantitative aptitude, logical reasoning, and reading comprehension, which can be tough for those who haven’t practiced these skills recently. For others, subjects like History or Ethics in the Mains exam can be demanding due to the need for deep understanding, analytical writing, and conceptual clarity. Ultimately, the “most challenging subject” varies from person to person, depending on their educational background and comfort level with different topics. The key lies in identifying your weak areas early and dedicating consistent effort to improve them.

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