Keep all your notes in order. A well-organised book or file will save you a lot of time when it comes to revision. Use your planner every day to record your prep / independent study and make short-term plans. If it is written down you are less likely to forget it! Having a file for each subject is a good idea. Teachers will give you numerous handouts and you will need a place to keep revision notes and mind maps, draft ideas for coursework or other.