Mock interviews can effectively prepare candidates for the UPSC interview phase by simulating the actual interview environment. Practicing with experienced panelists can enhance verbal communication skills, confidence, and the ability to think critically under pressure. Feedback received during these sessions can identify areas for improvement, such as body language, clarity of thought, and response coherence. Additionally, mock interviews help familiarize aspirants with common interview questions and allow them to refine their perspectives on current affairs and personal experiences, which are crucial during the actual interview.