To memorize factual information for UPSC, candidates can utilize several effective techniques. One prominent method is the mnemonic device, which aids recall through patterns and associations. Additionally, creating mind maps helps visually organize information, reinforcing connections between ideas. Regular revision is crucial; spaced repetition enhances long-term retention. Flashcards are also beneficial for quick reviews and self-testing. Engaging multiple senses by vocalizing facts or teaching them to others further embeds knowledge, making memorization more effective and sustainable over time.