Best practices for taking notes during UPSC preparation include employing the Cornell Method, which involves dividing the page into sections for cues, notes, and a summary. Using mind maps can help to visualize connections between topics. It's essential to summarize information in your own words to reinforce understanding. Utilize bullet points and clear headings to organize content, making it easy for quick revisions. Incorporating diagrams and charts can also aid retention. Regularly review and update your notes to keep them relevant and concise. Additionally, highlighting key terms can enhance focus and retention during revision.