Revisions are crucial in UPSC preparation as they reinforce knowledge by revisiting concepts over time, adhering to the Ebbinghaus forgetting curve. Regular revision helps candidates retain information and build a strong foundation for more complex topics. It aids in identifying weak points that require additional focus. Establishing a revision schedule ensures systematic coverage of the syllabus, reducing last-minute cramming. Engaging in active revision techniques, such as summarization and self-testing, can further enhance understanding and retention ahead of the exams.