It really depends on what you are already confident with. Its probably best to start with the topics you're not sure about yet. Then quickly go over the topics you already know. While you're still gaining confidence in the material you could write notes and do the questions in your textbook if you haven't already done them. Then once you're familiar with most of the content, you should do practice exams. And by do, I mean, always write down stuff you didn't get right so when you revise, you know which parts of the course you're not as good at. You should also read the exam reports so you can see common mistakes and the main points that the examiners want. If you come across difficult questions, dont just skip through them. If you're aiming for high marks, take the effort to learn how to do those questions in case they come up in the actual exam.
And also, to-do list or timetable would help if you're not organised. Just make sure you actually follow it and you should be fine.
Good luck with your studying!