I'm sorry you're having such a struggle with the verbal section. I do have one suspicion about what might be happening.
Often, as people learn to get better at something, they then slow down on some questions - they know more, so the feel like they "should" know how to get harder things right. Then, they speed up on others in order to make up the time.
People often end up spending extra time on the ones that are harder, and they speed up when they think "Oh, this one's easy, I can do it faster!" This kind of time (mis)management then leads to careless mistakes, and specifically mistakes on easier / lower level questions. That brings your score down.
Could something like that be happening in your case? We don't get data from the real test, unfortunately, but you may be able to spot this trend in your practice tests. How often are you going over time on problems? A little over is fine, but if you go more than about 30 seconds over, that can be problematic. And how often are you having to go significantly faster than average to make up time?
How often are you making careless mistakes? When you look after, how many times do you think "Oh, I can't believe I picked C. The answer is obviously D!"
The other possible culprit is mental stamina. Verbal's the last section of the test, so if you're really mentally tired out by then, your performance can drop quite a bit. When you were taking practice tests, did you do the IR and essay sections? Did you limit yourself to the two 8-minute breaks? Or did you skip sections, take longer breaks than allowed, or do anything else that deviated from the full official test conditions?
If so, then you may have had artificially inflated practice scores AND you may not have built up the mental stamina necessary to last for the whole 3.5+ hour test.
Think about what happened and look through the data in your last two practice tests. Tell me if you think either of those things was happening (or both!).
If you're having timing issues, read this:
https://www.manhattangmat.com/blog/inde ... lly-tests/And then these two:
http://www.manhattangmat.com/blog/index ... -to-do-it/http://www.manhattangmat.com/blog/index ... nt-part-1/If you're having stamina issues, first know that you need to do all tests under 100% official conditions (including essay and IR). Also, look at this:
http://www.manhattangmat.com/blog/index ... you-crazy/If you're noticing careless errors:
http://www.manhattangmat.com/blog/index ... -the-gmat/If you also want help on specific content areas, then use the below to analyze your most recent MGMAT CAT (this should take you a minimum of 1 hour):
http://www.manhattangmat.com/blog/index ... ice-tests/Figure out your strengths and weaknesses as well as what you think you should do based on that analysis. Then come back here and tell us; we'll tell you whether we agree and advise you further. (Note: do share an analysis with us, not just the raw data. Part of getting better is developing your ability to analyze your results - figure out what they mean and what you think you should do about them!)