Techniques for effective note-taking during UPSC studies include using the cornell method and integrating visual aids like diagrams and charts that facilitate memory retention. Organizing notes into thematic categories helps in quick revisions. Summarizing information in one's own words fosters better understanding and recall, while employing bullet points can make notes concise and easily referable. Incorporating review sessions, where notes are revisited at intervals, ensures that knowledge remains fresh, aiding aspirants in retaining crucial information for both written exams and interviews.