The purpose of the Civil Services Aptitude Test (CSAT) in the UPSC exam is to evaluate the aptitude and skills of candidates in specific areas essential for civil service roles. The CSAT assesses candidates in areas like comprehension, logical reasoning, and numerical ability. This test serves to ensure that selected candidates possess the necessary analytical skills to tackle various challenges in public administration. While it comprises qualifying marks, performance in CSAT is crucial as it influences overall evaluation and selection in subsequent stages of the UPSC examination process.