The UPSC selection process comprises three stages: the Preliminary examination, Mains examination, and the Interview (Personality Test). Candidates first take the Preliminary exam, which serves as a screening test for the Mains. Those who qualify the Mains, consisting of written papers, move on to the Interview stage, where their personality and suitability for civil services are evaluated. This structured approach aims to comprehensively assess candidates on their knowledge, analytical abilities, and interpersonal skills, ensuring the selection of well-rounded individuals for public service roles.