The UPSC examination process consists of three primary stages: the Preliminary Examination, Mains Examination, and the Interview or Personality Test. The Preliminary exam serves as a screening test consisting of objective-type questions, while the Mains involves descriptive papers that assess candidates' in-depth knowledge and analytical skills. Finally, the interview aims to evaluate personal attributes and suitability for a career in civil services. Together, these stages ensure a comprehensive evaluation of candidates' knowledge, skills, and potential for public administration roles.