To memorize vast amounts of information for UPSC, candidates can utilize several effective methods. Techniques like spaced repetition enhance retention by revisiting material at increasing intervals. Creating mnemonics and simplifying complex information into bite-sized pieces also aids memory. Visual aids, such as charts and diagrams, can help in organizing information visually for easier recall. Engaging in active recall, through quizzes or flashcards, reinforces learning. Additionally, discussing topics with peers allows for collaborative learning, solidifying understanding. A combination of these methods can promote efficient retention and retrieval of essential information during exams.