Best practices for note-taking during UPSC preparation include organizing notes methodically, using bullet points for clarity, and incorporating visual aids like mind maps. Keeping notes concise but informative ensures essential information is readily accessible for quick revisions. Utilizing different colors or formats can help categorize topics, making recall easier. Regularly reviewing and updating notes helps reinforce learning, while summarizing information in one's own words enhances retention. Additionally, integrating sources like NCERT books and reference materials ensures comprehensive coverage of relevant content.