Candidates can develop a strong foundation in Indian history relevant to UPSC by following a strategic approach. They should start with chronological study, beginning from ancient to modern times, using recommended textbooks like NCERTs and standard works. Regular revision, integrating art and culture, and correlating historical events with their impacts on contemporary India enhances understanding. Participating in discussions, solving previous years' questions, and utilizing online resources like videos or quizzes can further solidify their grasp of historical concepts needed for the exam.