Effective revision techniques for long-term retention in UPSC include spaced repetition and active recall methods, which enhance memory consolidation. Creating concise summaries and mind maps can facilitate quick reviews and reinforce understanding. Using practice tests and previous years' questions helps candidates familiarize themselves with the exam format while assessing their knowledge. Group discussions provide opportunities to clarify concepts and exchange insights, which can deepen understanding and retention. Regular revisions integrated into the study schedule ensure sustained preparedness.