In 2013, the UPSC introduced significant changes to its examination format by merging the previous preliminary and main exams into a two-stage process. This new system included an initial screening of candidates through the Preliminary Examination, followed by the Main Examination where detailed assessments occur. Additionally, the introduction of the CSAT (Civil Services Aptitude Test) in the Preliminary stage emphasized analytical and comprehension skills, making the selection process more comprehensive and aligned with the competencies required for civil service roles.