Sorry to hear that you had such a bad testing experience, GMATer! Sadly, I think that this is the key line from your original post:
Quote:
But I felt really anxious and nervous during the verbal exam; I think that's what killed my score.
That's definitely the culprit -- or at least the thing that caused the drop from, say, V33 to V21.
In some sense, I think you have two different issues here. First, you're asking about study materials... so let's deal with that part first. You haven't left a ton of official verbal questions left untouched, but you'll definitely want to get a copy of the Official GMAT Verbal Guide if you don't already have one. Another option is to get an older edition of
the official guide: if you're using, say, the 2017 edition, you could try to track down a used copy of the 12th edition, and about half of the questions would be unfamiliar to you. That'll stretch your materials a little bit further. I'm also
a big fan of using LSATs if you need more CR and RC practice.
It sounds like the second issue is the nervousness. There are a million things that you could do to work on this -- and it's absolutely a conquerable thing. It's possible that you'll feel much less stressed with more practice, particularly if you concentrate on making sure that your verbal pacing and strategies are 100% consistent. It's possible that you'll feel MUCH better on your second attempt at the test; GMAT testing centers are an odd environment, so a lot of people perform better once they've been in there once or twice. And sometimes small things can worsen the nervousness:
letting your blood sugar get too low, or too much caffeine, or not enough sleep.
Obviously, I have no idea which of these actually apply to you, or the problem could be something else entirely. But my hunch is that if you concentrate on making sure that your approach to each verbal question type is mind-numbingly consistent, things will go better for you. And sometimes plain old experience in the testing center makes all the difference.
Let me know how it goes for you!