The UPSC Civil Services Exam process comprises three stages: the Preliminary Examination, the Mains Examination, and the Personality Test. The preliminary stage consists of two objective-type papers that test general knowledge and aptitude. Candidates who qualify then face the Mains Examination, which includes subjective papers focused on various subjects, including optional papers. Finally, the Personality Test assesses candidates based on their personal attributes and suitability for civil services, completing the rigorous selection process for prospective civil servants.