Effective note-taking strategies for UPSC studying include using structured formats like outlines and bullet points to maintain clarity. Incorporating diagrams, charts, and flowcharts can simplify complex information and enhance memory recall. Candidates should focus on key concepts and use their own words to promote better understanding. Regularly revisiting and revising notes ensures retention, while summarizing topics allows for quick reviews. Utilizing digital tools or apps for note-taking can also streamline the process and make it more efficient.