During the last weeks of school, students generally spend several days a week revising and repeating certain basic sections of the lesson. It is an opportunity that any good student should take advantage of. Make some graphics that summarize each of the main subjects that need to be revised and pin them up in front of your desk. Look at the first subject in the list from time to time and try to ask yourself questions about the key concepts; see if you can answer the questions. When you consider that you master that subject, cross it and replace it with the next one, repeating the process until you have mastered them all.