However, you will not be doing yourself any favours by trying to cram a lot in at the last minute. So be strategic. Do not try to do all the revision at once. We learn much better in short bursts. Therefore, your revision should focus on small chunks of learning rather than trying to do the whole syllabus in the evening before the examination.
Revision means what it says.
You are revising something you have already learned. Therefore, you need to have learned it in the first place. There are a variety of techniques for revising, but sitting in a comfortable chair with your feet up reading through your notes is not the best way to take the information in. Try to make your revision as active as you can. You should read the material, shut the book or notes, and then see how much of it you can actually remember when you try to reply to a sample question.