The UPSC civil services examination consists of three main stages: the preliminary examination, the main examination, and the interview stage. Each stage is designed to evaluate different skill sets and competencies required for effective public administration. The prelims test candidates' general awareness and aptitude through objective questions, acting as a screening test. The mains then assess candidates through descriptive essays and subject-based papers, while the interview phase, also known as the personality test, examines candidates' overall personality, communication skills, and suitability for civil services.