— i.e. months, not days before the exam.
2. Plan your revision using a timetable

Planning out your revision means you can spend more time revising and less time worrying you've forgotten something. CGP's amazing How To Revise book has plenty of timetables for you to fill in yourself, with loads of great tips on how to make the most of the revision period.
3. Don't spend ages making your notes look pretty

This is just wasting time. For diagrams, include all the details you need to learn, but don't try to produce a work of art.
4. Set up a nice, tidy study space

You'll need somewhere with good lighting, your pens close by, your phone out of sight and your TV unplugged. Try not to revise on your bed, or you'll be dreaming of pink igloos and elephants before you know it.
5. Vary your revision with different activities

Try a variety of different revision techniques — answering practice questions, writing down notes from memory, and using Revision Guides, Flash Cards, Exam Practice Workbooks etc. CGP have the best revision books money can buy (blatant advert, but you are on our website...)
6. Stick revision notes all around your house

So in the exam you think, "Aha, quadratic equations, they were on the fridge..."
7. Do lots of practice papers and questions

You'll find it far easier to answer questions in the exam if you've tried similar ones at home beforehand. Check out CGP's amazing range of practice papers for some top practice. Alternatively, have a look at your exam board's website for a selection of sample papers — but you'll have to get your printer working to get a hard copy of those. Yikes.