Candidates should review their notes regularly while preparing for the UPSC exam, ideally on a weekly or bi-weekly basis. This frequency helps reinforce learning by ensuring that information remains fresh in their memory. Regular revisions allow candidates to identify weak areas and focus their study efforts accordingly. Creating summary notes can further facilitate quick reviews before the exam. A consistent revision schedule also alleviates last-minute panic, providing candidates with the confidence and familiarity required to tackle diverse topics effectively during examinations.