I'm sorry that you had such a disappointing experience on the verbal. I'm glad that you were able to reach your target on the quant, though - that is something to be proud of, even though you're not happy about the verbal side of things.
So, the good news is: we've got one test on which you achieved your target verbal score and one on which you achieved your target quant score. How can we get those two to happen on the same test? (I'm saying this is good news because your task would be a lot harder if you hadn't been able to achieve those targets at all.)
I think what you described actually does give us a clue as to what happened in the verbal. First, you didn't do the essays on the practice tests. I know you said you felt fine, but your brain just isn't quite as sharp at the 2.5-hour mark as it is at the 1.5-hour mark. On your practice tests, you were getting into the verbal at the 1.5-hour mark and the test was over by the 2.5-hour mark. On the real thing, you were starting the verbal at the point that you were used to being done with the test. That's going to have some (negative) effect. (I talk to people
all the time, by the way, who experience significant score drops on verbal and one of the things most have in common is that they didn't do the essays on practice tests. It makes a much bigger difference then you think.)
Then, you ran out of time a bit and had to guess randomly on 2 of the last 3. Let's assume that you got both wrong and, further, let's assume that you might have missed a 3rd one somewhere in there because you were rushing in general and probably feeling a bit stressed. That would mean you'd missed 3 of the last 4 or 5. Let's further assume that the ones you got wrong all counted (they weren't experimental) and that, if you got one right, it was an experimental. Basically, we're assuming worst-case-scenario here.
If you were scoring in the 90th percentile going into that last string of 4 or 5, then the penalty for getting 3 of those wrong would be significant. The test severely penalizes very high scorers for running out of time - even more so than moderate scorers. At the 70th percentile, getting the last 5 wrong would result in a drop of 15 percentile points. At the 90th percentile, we don't know the exact penalty, but we were told by GMAC's chief psychometrician that the penalty gets more severe as the score gets higher. So let's say that, in our worst-case scenario, that blip at the end cost you 10 to 15 percentile points, which drops you down to 75th to 80th.
But we haven't factored in the "no practice essays" data point yet. So, let's say that, going into those last 4 or 5, you were only at the 80th percentile because you'd made a few careless mistakes you wouldn't normally have made (and, again, if you have the capability to achieve a very high score, then a few extra careless mistakes will make a BIG difference). Now, the penalty won't be quite as big because the score's not as high. So let's say the penalty is 8 to 10 percentile points. That's putting us down near 70th percentile - which is about what you scored.
The short point: I think the timing issue at the end and the under-preparedness for the length of the exam could actually account for the 10-20 percentile drop you experienced on the test.
So now we have something to do here. If we can keep your momentum on the quant and tweak these problems on the verbal, then maybe you can deliver a test performance in which you hit your targets on both quant and verbal on the same test.
It also sounds like you might be feeling a bit burned out / frustrated (which is not surprising!). You may want to take a week or two off completely. Then start here:
http://www.beatthegmat.com/a/2009/09/23/evaluating-your-practice-testsUse this article to help you analyze your performance on your most recent practice test* so that you can set up a study plan to move forward. If you want to discuss, post your analysis here (and I hope you do!) and we can help you figure out what to do.
*Ideally, pick the most recent test that you took under full official conditions. If you didn't take the essays on
any recent tests, then you're going to have to decide whether it's worth it to take another practice test under full conditions, especially because you have taken MGMAT and GMATPrep enough that you're becoming too familiar with the questions. The benefit to doing this, though, is that you may be able to find patterns about where you tend to fall a little short when you hit the verbal 2.5 hours in rather than 1.5 hours in. (If you decide to take a couple of weeks off, that might help you to forget some of the test questions.)
Use this article to help learn how to review the individual questions from that test (and any other questions you do in future):
http://www.beatthegmat.com/a/2009/10/09/how-to-analyze-a-practice-problemAgain, if you have any questions or want to discuss aspects of that, feel free to come back here and ask.
If you do take a practice test and see repeats, follow these guidelines to minimize the chance of artificially inflating your score via question repeats. First, anytime you see a problem that you remember (and this means: I know the answer or I'm pretty sure I remember the answer, not just "hmm, this looks vaguely familiar..."), immediately look at the timer and make yourself sit there for the full length of time for that question type. This way, you don't artificially give yourself more time than you should have. Second, think about whether you got this problem right the last time. If you did, get it right again this time. If you didn't, get it wrong again. If you *completely honestly* think that you would get it right this time around if it were a new question (even though you got it wrong last time) because you've studied that area and improved, then get it right this time.