Effective revision methods before the UPSC exams include creating summary notes for important topics, participating in group studies, and taking frequent mock tests to simulate exam conditions. Revisiting past year papers can help candidates understand question patterns and improve time management. Techniques such as active recall and spaced repetition can enhance memory retention. Additionally, categorizing current affairs into themes can simplify revision. Utilizing various resources like online lectures, quizzes, and flashcards can also provide diverse methods to reinforce knowledge.