Understanding demographics improves performance in the UPSC examination by enabling candidates to analyze socio-economic trends, policies, and their implications effectively. Knowledge of demographic dynamics such as population growth, age distribution, and migration patterns is crucial for answering questions in areas like population studies, economic planning, and sustainable development. Additionally, candidates can leverage this knowledge in the interview stage, demonstrating an informed perspective on policy formulation and implementation. Familiarity with demographic changes fosters critical thinking, essential for civil service roles.