The day before, I went over my notes and tried to visualize them. I have a photographic memory but it doesn't last very long. I had such a headache from studying that I really tried to not look at too much the day before so I would feel okay the next day.
When you take the exam, don't focus on the difficulty too much and the testlets being adaptive. Take one question at a time and read it thoroughly. Some will be easy and some will be hard in all three testlets. Leave an hour and a half to two hours for the simulations.
Just think about how much you prepared and realize you can't know everything. No one can. If we don't pass this time, it's not the end of the world, there's always another window and hopefully we end up with an exam that we know enough to make a 75. There is some element of luck involved. I used to think there wasn't but know I do, so good luck!