For effective UPSC preparation, candidates should prioritize subjects based on their strengths, exam weightage, and interlinking topics. Starting with Fundamental subjects like History and Polity provides a solid foundation for understanding other areas. Next, focusing on Current Affairs helps contextualize knowledge across various subjects. Subjects like Geography and Economy can be combined for simultaneous study, as they are interrelated. Finally, revising optional subjects last ensures a comprehensive understanding. This structured prioritization aids in efficient time management and topic coverage.