Candidates can build a strong foundation in polity for the UPSC exam by thoroughly studying the Constitution, focusing on key features like fundamental rights and duties. Engaging with standard texts like "Indian Polity" by M. Laxmikanth solidifies understanding. Regularly revisiting current affairs relevant to governance and policy movements helps apply theoretical knowledge to real-world scenarios. Participating in discussions or study groups can facilitate deeper comprehension and retention. Moreover, relating polity to historical contexts enhances clarity and relevance for aspirants.