The final ranking of candidates in the UPSC examination is determined through a comprehensive evaluation process. After the preliminary examination, candidates who qualify proceed to the Mains examination, where they are assessed on multiple subjects through written tests. Following the Mains, successful candidates undergo the interview stage, which contributes to the final merit list. The overall ranking is based on the cumulative scores from the Mains and interview phases. Therefore, comprehensive preparation across all stages is critical for aspirants aiming for a high final ranking in the civil services examination.