Effective note-making during UPSC preparation can significantly enhance retention and understanding. Candidates should adopt the cornell method or mind mapping to organize thoughts coherently. Highlighting key terms, summarizing in concise bullet points, and integrating visual aids can make notes more engaging. It's beneficial to regularly revise and update notes with current affairs to keep them relevant. Additionally, using technology like apps for digitized notes can aid in easy access and searchability anytime, aiding comprehensive preparation for the examination.