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<p>Well, safe and except the recent QAS that are floating around the internet, you used the very best tests. The rest of the wannabe tests will NOT help you. There is something amiss in your adventure. None of us can do more than speculating as why your scores were so much out of line. Again, buy the related QAS/SAS and review what happened. </p>
<p>It is very unusual to see such a large difference for someone who took 17 real tests. Until you know fully what happened, you cannot jump to conclusions. My recommendation is to try to locate a past QAS and take it under similar conditions. I usually think that sitting through full tests as a preparation is mostly a waste of time, it might be helpful in your case. Perhaps you got tired. Perhaps you did get a very unusual bad test or a bad scoring machine. Again, none of us can help you figure that out. Only TCB can. </p>