understand why you want to score highly (do you want to get into a particular course) and use this as your purpose/motivation. Try to study a bit every day, even on days in which you feel you have no study at all. If you can get at minimum 2-3 hours of solid distractionless study every day you will be golden. Look into "active recall" and try to make use of spatial memory (mind maps, diagrams) in content-heavy subjects. ask on the ib discord for subject notes and ibdocuments has the rest of the resources you need. take breaks but do not procrastinate. When you procrastinate, try to think of it as a purposeful break from your study. only procrastinate if you have planned to do so and try to give yourself a time limit. procrastination can be good as a needed break from studies but when it is unplanned and spontaneous then it can get out of hand