Aspirants can develop effective note-taking techniques for UPSC preparation by employing methods like the Cornell system, mind mapping, or outlining. These techniques promote active engagement with the material, allowing candidates to retain information better. It's beneficial to summarize complex topics in their own words, ensuring a deep understanding. Regularly reviewing and revisiting notes can reinforce learning. Furthermore, categorizing notes by subject or theme makes revision more efficient, enabling quicker access to important information close to exam dates.