To apply theoretical knowledge effectively in the interview stage of UPSC, candidates should focus on real-world applications and practical implications of concepts learned. Engaging in mock interviews allows aspirants to simulate real scenarios and practice articulating their thoughts clearly. Building an understanding of current affairs and relating them to academic theories helps candidates demonstrate their analytical capabilities. Furthermore, reflecting on personal experiences and integrating them into responses can enhance authenticity and depth. Finally, displaying a genuine interest in various subjects during interviews signals a well-rounded candidate, essential for civil service roles.