The UPSC selection process comprises three distinct stages: the Preliminary Examination, the Mains Examination, and the Personality Test. The prelims serve as a screening test consisting of two objective-type papers that assess general studies and aptitude. Candidates who qualify advance to the Mains, which includes nine descriptive papers, emphasizing comprehensive understanding and analytical writing skills. Finally, those who succeed in the Mains are invited for the Personality Test, which evaluates their suitability for civil services based on personality traits and communication skills. Each stage is crucial for determining candidates' overall performance and readiness.