Mock interviews serve as valuable preparation for candidates by simulating the real UPSC interview environment. They help aspirants gain experience in presenting themselves, articulating thoughts clearly, and handling pressure effectively. Constructive feedback from mentors during these interviews highlights areas of improvement and boosts candidates' confidence. Participants can also learn to manage body language and tone, vital components in interviews. Overall, mock interviews provide a realistic platform for candidates to refine their skills and prepare thoroughly for the actual interview.