Why is CSAT considered only a qualifying paper in UPSC Prelims?

The Civil Services Aptitude Test (CSAT) is designated as a qualifying paper to ensure equity and fairness for candidates from various academic streams. Originally, when CSAT was introduced in 2011, its marks were counted toward the merit list. However, this sparked significant debate and protests, as candidates from rural and humanities backgrounds argued that the heavy focus on mathematics and logic disproportionately favoured those from engineering or technical backgrounds.
In response to these concerns, the government reformed the exam structure in 2015, making CSAT qualifying in nature. This change shifted the primary focus of the Preliminary stage back to General Studies, which covers core subjects like History, Polity, and Economy—areas deemed more central to a civil servant's foundational knowledge.
Currently, the CSAT serves as a minimum competency "gatekeeper." Candidates must secure at least 33% (66.67 marks) to pass. While these marks do not influence your final rank or merit cutoff, failing to meet this threshold results in immediate disqualification, even if you perform exceptionally well in General Studies. Effectively, CSAT ensures a candidate possesses basic analytical skills without allowing those skills to overshadow the broader knowledge required for public service.