Successful performance in the UPSC interview requires several key skills. Firstly, candidates need excellent communication skills, enabling them to articulate their thoughts clearly and confidently. This includes being concise and relevant. Secondly, analytical skills are essential for evaluating and responding to complex questions effectively. Candidates should also exhibit strong emotional intelligence, allowing them to engage empathetically with the interviewers. Additionally, demonstrating a comprehensive understanding of current affairs and having a well-rounded perspective on various societal issues is crucial. Finally, candidates must possess interpersonal skills to create a positive rapport during the interview.