To memorize the vast UPSC syllabus effectively, candidates can employ strategies like spaced repetition and active recall. Breaking down topics into manageable chunks and reviewing them systematically enhances retention. Utilizing mnemonic devices can aid memory, while creating mind maps visually organizes information. Regular revision sessions ensure that knowledge remains fresh, and practice quizzes can reinforce learning. Setting specific goals for memorization, such as timelines for each topic, can further enhance focus and motivation, making the process more structured.