Techniques for memory retention during UPSC studies include the use of mnemonic devices, active recall, and spaced repetition. Mnemonics simplify complex information by using patterns, which aid recall. Active recall involves testing oneself on learned material to reinforce memory, while spaced repetition emphasizes revisiting topics over increasing intervals, optimizing long-term retention. Additionally, visual aids like concept maps and infographics work well in consolidating knowledge. Engaging in discussions or teaching others about a topic also enhances retention by reinforcing understanding. Combining these techniques can create a more effective study routine, ensuring better recall during examinations.