Is anyone else find that luck plays a HUGE part in the GMAT score? For the quant specifically, my score is a lot better if certain types of problem don't crop up in the beginning and take up a lot of time to solve.
I got a score I was happy with on a practice test, because the combination problem didn't come until much later. For another practice test, I had an abstract number properties question that took a lot of time, and when time was low I started to panic.
I hope on the real thing, I know how to do the first 20 and all the hard ones are the ones that are experimental questions!