Candidates can enhance their interview performance in the UPSC by engaging in mock interviews and practicing with peers or mentors. They should also focus on effective communication skills, including articulation and body language. Staying informed about current affairs and personal achievements is crucial. Furthermore, candidates should develop a clear understanding of their motivation for civil services and articulate their vision for their roles. Reflecting on past experiences and honing answers to typical interview questions will boost confidence and improve overall performance during the actual interview.