Methods that can boost retention of learning materials for the UPSC exam include active recall, spaced repetition, and the use of mnemonic devices. For instance, regular self-testing through quizzes can reinforce memory and understanding of key topics. Spaced repetition, involving revisiting content at increasing intervals, helps solidify long-term memory retention. Additionally, creating mnemonics or visual associations can aid memorization of complex information. Engaging in group discussions and teaching concepts to peers can also enhance understanding and retention. By adopting these strategies, aspirants can improve their grasp of essential materials for success in the UPSC exam.