The Constitution of India serves as the foundational framework for the UPSC examination by delineating the structure, powers, and responsibilities of the executive, legislative, and judiciary branches. It ensures that candidates are well-versed in core constitutional values such as democracy, secularism, and social justice. Familiarity with constitutional provisions equips aspirants to tackle questions related to governance, public administration, and human rights during the examination. Ultimately, the Constitution shapes not only the examination framework but also the principles that guide civil service roles.