Study while rotating the subjects every day (or however you want to do it). Don't forget to
take breaks. You can have a nap - it will help you remember. You'll probably get tired after studying anyway.
I also started using mind maps. I wish I used them before. I use this software:
XMind: Professional & Powerful Mind Mapping Software. There's a free version. It's great for seeing the overall picture of whatever you're studying and you can see where things go and how they may relate to other concepts. Not particularly great for courses like math or stats though. I study my detailed notes first, then as I approach exam day I just studying using these mind maps. I can focus on the important things instead of all of these details, and if I'm unsure of something, I'll refer to the notes.