The variations in success rates among UPSC candidates can be attributed to multiple factors. Key contributors include the level of preparation, access to resources, and prior academic background. Candidates with structured study plans, effective time management, and mastery of the syllabus often perform better. Additionally, socio-economic factors can impact access to coaching and materials, creating disparities. Motivation and perseverance play crucial roles, as does the candidate's approach to mock examinations for self-assessment. Finally, early awareness of the exam structure can influence candidates' strategies and subsequent success rates.