Interdisciplinary knowledge is crucial for UPSC exams as it broadens an aspirant's understanding of various subjects such as politics, economics, and environmental studies. This holistic knowledge enables candidates to connect concepts, analyze current affairs, and relate them to relevant issues in society. An interdisciplinary approach enhances critical thinking and problem-solving abilities, making candidates more equipped for the diverse challenges presented in the exam. Overall, it prepares aspirants not just to answer questions but to think creatively and analytically in the face of complex scenarios relevant to civil services.