Interdisciplinary knowledge plays a crucial role in UPSC preparation by fostering a comprehensive understanding of complex issues. It enables aspirants to connect concepts across different subjects, such as relating politics to economics and environmental science. This holistic approach not only assists in answering questions but also enhances critical thinking and problem-solving abilities. Exposure to diverse disciplines helps candidates appreciate various viewpoints and improves their ability to create well-rounded arguments in essays and interviews. Collaborating with peers from different backgrounds can further boost interdisciplinary learning.