During the UPSC interview, candidates must demonstrate several imperative skills, including critical thinking, effective communication, and adaptability. The ability to articulate thoughts clearly and confidently is essential, as is the capacity to engage with diverse questions on current affairs and personal background. Additionally, showing genuine interest in socio-economic issues, displaying a balanced viewpoint, and maintaining composure under pressure are crucial. A strong understanding of ethics and integrity will also reflect a candidate's suitability for public service, which is paramount in the interview stage.