The stages of the UPSC Civil Services Examination include three main parts: the Preliminary Exam, the Mains Exam, and the Interview (Personality Test). The prelims consist of two objective-type papers to screen candidates for the Mains. Those who qualify then take the Mains, which includes written examinations across several subjects and an essay paper. Finally, successful Mains candidates go through the Interview stage, where their suitability for various civil services positions is evaluated. This multi-stage process assesses candidates' knowledge, analytical abilities, and interpersonal skills.