Cramming everything into a three day period can cause so much stress and anxiety that's just not good for you. The good news is that you've probably already taken a midterm for your classes so you should have an idea of the format for your final exam. While in your classes, pay attention to things that would match the format of the midterm you already took. Did you have to know dates and how to spell names? Or was it focused more on general facts and concepts? This will help you when taking notes and will make studying them later much easier. Also, if your professor repeats something, it's probably important enough to write down.