Aspirants can practice taking notes effectively for vast UPSC materials by adopting techniques like the Cornell note-taking method or using mind maps. Summarizing information in their own words enhances retention and understanding. Incorporating bullet points, headings, and diagrams also aids clarity. Regularly revisiting and revising these notes will reinforce knowledge, while maintaining concise notes encourages constant review. Furthermore, using digital tools or apps can help organize materials systematically, making it easier to retrieve and study information during the preparation process.