What is the claim of 90-95% worth anyways? All it proves is that you can cram for the test based on the question bank, which is pretty much public information. From watching people take the exam, it is clear that many are basically recalling answers from memory, as there is no way they could actually have properly read all the questions in the time I saw them finish in.
FWIW, I thought I was going to fail an exam or two the last time around, but turns I out I just passed. I don't really care what my scores are as long as I pass and don't really care to work for someone who feels that the results are in any way relevant.