The UPSC Civil Services Examination in India consists of three stages: a preliminary exam with objective-type papers, a mains exam with subjective papers, and a personality test. Eligibility for candidates includes being an Indian citizen or a person of Indian origin with specific educational qualifications and age limits. The exam is highly competitive, attracting around 900,000 to 1,000,000 applicants annually, with various services and positions available for successful candidates.