Try to study in intense increments. Study for about 10-20 minutes and then break. When you resume, see how much you can simply recite off of the top of your head.
Don't study in front of your computer. You WILL be side tracked.
Get a good sleep. Yes this is cliche. Deal with it.
Eat. Have a full breakfast and a good cup of coffee. No espresso.
You don't have to study months in advance, but don't cram either. try to start two night ahead and break it up into chunks.
Repetition. You didn't learn every word to Beyonce's entire album by only hearing the songs once. Repeat useful vocabulary as much as possible.
Relax. Honestly, if you have paid attention you probably will be fine. If you haven't, I have no sympathy for you.
Good luck to all. xoxo