Aspirants can effectively use flashcards in their UPSC preparation by creating concise, targeted cards for key concepts, definitions, and **current affairs** summaries. This technique enhances memory retention through active recall practice. Organize flashcards by subject or topic, frequently revisiting them for spaced repetition. Incorporate visual elements or mnemonics to aid recollection. Flashcards can also be used in group study sessions, encouraging active engagement and discussion. By regularly testing oneself with these cards, aspirants can reinforce their knowledge and improve their overall grasp of the vast syllabus.