Effective ways to prioritize topics while studying for UPSC include creating a study schedule and systematically categorizing subjects by weightage and relevance. Break down the syllabus into manageable segments, focusing on core topics first, then progressing to less significant areas. Reviewing previous years' papers helps identify frequently asked questions and critical themes. Regularly assessing your strengths and weaknesses aids in allocating more time to challenging subjects, ensuring a balanced preparation. Additionally, practicing time management during revisions and creating a priority list can enhance focus and drive progress.