CGP guides. Seriously, they are so helpful. Also, for English, read the books again, read up on the context of the book, and if you want to, watch a production of the text. That helped me a lot for All My Sons. Make a revision timetable, and make sure you stick to it. If you really want to excel, revise for the whole of Easter with an ocean of past papers, and distance yourself from TV and your phone. Obviously don't completely leave them out, but limit how long you spend on them. My revision timetable went something like: 45 mins revision, 15 minute break, 45 mins revision, 15 minute break, and so on. You should have your exam timetable by now, and that should help you choose which subjects you revise and when. Good luck!