Techniques to enhance memory retrieval for UPSC subject matter include methods such as spaced repetition, mnemonics, and visual aids. Spaced repetition involves reviewing material at intervals, reinforcing memory retention and promoting long-lasting recall. Mnemonics can be used to create memorable associations and shortcuts for difficult information, simplifying complex concepts. Utilizing visual aids like charts, graphs, or infographics presents information in a more accessible format, enabling better comprehension and recall. Together, these techniques create an effective study regime, allowing candidates to retain information efficiently for the comprehensive UPSC examination.