Understanding demographic trends is advantageous in UPSC preparation as it provides critical insights into the socio-economic fabric of India. Knowledge of population dynamics, such as age distribution, migration patterns, and literacy rates, can inform responses related to developmental policies and planning. This understanding helps candidates critically analyze the impact of demographic changes on governance and public administration. Additionally, being well-versed in demographic indicators enhances the ability to address questions on welfare schemes, social justice, and health policies effectively in both written and interview formats.