Regular revision is crucial when preparing for the UPSC as it helps reinforce knowledge and improve long-term retention. Revising topics consistently allows for better recall during exams, reducing the likelihood of forgetting essential information. Regular revision also helps identify weak areas that need more focus and ensures that candidates stay updated with current affairs. Incorporating a mix of techniques such as summarizing notes, engaging in discussions, and taking mock tests can enhance the revision process. Ultimately, a structured revision plan is essential for building confidence ahead of the exam.