Candidates can build a well-rounded knowledge base for the UPSC exams by adopting a multifaceted approach. This includes studying diverse subjects such as History, Geography, Political Science, and Current Affairs. Regularly reading newspapers, journals, and reports enhances awareness of current events and broadens perspective. Furthermore, engaging in discussions with peers and mentors can help clarify concepts and provide insights into complex topics. Candidates should also make use of online courses and study materials tailored for UPSC to ensure comprehensive coverage of the syllabus.