The process that UPSC uses to shortlist candidates for interviews is known as the Mains examination, followed by an interview, or Personality Test. After candidates successfully clear the Preliminary exam, they sit for the Mains, consisting of several written papers. Based on the performance in Mains, UPSC prepares a merit list to invite candidates for the interview stage. This sequential process ensures that only those with a strong understanding of the syllabus and aptitude for public service proceed to the final assessment, ensuring quality candidates for civil services.