Effective note-taking methods for UPSC preparation include techniques like the Cornell note-taking system, which encourages organized and concise summaries, and mind mapping for visually connecting concepts. Additionally, using bullet points to highlight key ideas and employing abbreviations can streamline the process. Aspirants should focus on active listening during lectures and discussions, integrating their own insights into notes. Regularly revisiting and revising notes enhances retention of information, while incorporating different colors can aid in memorization and understanding complex topics. Experimenting with these methods can lead to tailored and effective study strategies.