Best practices for revising before the UPSC examination include creating a comprehensive revision plan that prioritizes weak subjects. Candidates should summarize key topics through notes and engage in active recall, testing their knowledge regularly. Utilizing flashcards and participating in group discussions can further solidify understanding. Setting a timeline for each subject and including mock tests in the schedule prepares candidates for the exam format. Lastly, incorporating breaks and regular self-assessment enhances retention and keeps motivation levels high.