Revisions play a critical role in the UPSC exam preparation process as they reinforce learned concepts and ensure better retention of information. Consistent revision helps aspirants identify gaps in their understanding and solidify their grasp on important topics. It enhances recall ability on exam day, crucial for both the preliminary and mains exams. Effective revisions can be accomplished through summary notes, mind maps, and flashcards, enabling quick reviews of key concepts without rereading entire textbooks.