The calculator messed me up. I was practicing with windows calc and it seemed perfect. I would always finish practice tests with time to spare and got 21+ on all QR practice but on the real, I got a 19. The math wasn't harder...but as far as the calculator goes it:
1. Doesn't automatically clear itself after you finish a calculation (like normal calcs do).
2. Sometimes you have to punch in the number twice or click hard for it to register.
Those 2 things make the calculator super annoying. I had one simple problem and I was recalculating 2300 x 1300 about 3 times because I couldn't get used to the issues of the calc. (I hate doing long multiplication by hand because I always mess up if I'm in a rush so I needed the calculator). Towards the end of the test I got used to clearing each calculation and punching in numbers carefully, but I wasted too much time in the beginning to do as well as I could have ;/. If you are going to use the calculator, be very aware of these 2 issues. If you can find a way to practice with a crappy calculator, do that.
And also be aware that by the end of this thing when you're trying to do math, you are mentally drained. Even if you do multiple practice tests and feel fine doing QR, when you are at the end of the real test...your brain is like : @_@ x_x
#_#.