Honestly speaking, I never got that high score in any of my practice exams, and never did I get such low score in verbal for that matter.
However, what I found was that whenever I took practice test, i made lots of silly mistakes in quant. I honestly found all the questions solvable. The key was to be careful with my weakness. My weakness was with data sufficiency questions. I was able to analyze the questions but would usually miss out on checking all aspects of the question. For example, I used to start assuming that both statement A and B are sufficient together (option C) and then work backwards (towards option A, B, D, E). It is a wrong strategy. Always assess the first statement by itself, then second by itself and then both of them together. This sounds very obvious but it took a careful consideration for me to figure it out.
I was good at word problems. So I took the liberty of solving word problem in one go and never revised the answers (i mean you usually check your answer twice before confirming the answer). This saved me time for data sufficiency. There is no need to study hardcore permutations and combination or probability. I am not a big fan of using formulas, because even though they help you in some cases, they may as well lead you to wrong answer if applied incorrectly.
All probability question that I solved was on the count basis. You use basic rule like nCn, nPn, but that's it. Use venn diagram as much as you can. And GMAT doesn't throw a problem in set theory or probability which need complicated calculations. So the key is to find your weakness and assign more time to in the exam.
I wish I would have done the same in Verbal. I was stupid enough in verbal. Partly because i missed to answer the last question, even when I had 3 mins to answer it. I had the answer in my mind but I was trying to confirm it and in the meantime forgot to check the clock and suddenly the test said 'time up'. I was devastated but I am glad that maths saved me.
(send some email, call them sometime and tell them your career development meantime 8) )
