Effective note-taking strategies for UPSC subjects include the use of mind maps and summaries. Create structured notes that highlight key concepts, definitions, and significant dates. Use bullet points, diagrams, and color coding to enhance visual memory. Regularly revisit these notes to reinforce learning and enable better retention. Additionally, categorize information thematically to make it more accessible for revision. Incorporating digital tools can also aid in organizing notes and resources, making it easier to retrieve important information when necessary.