Hi GhostA,
While there are certainly ways to help you improve your Quant Scaled Score to a Q45, you might not be able to properly incorporate them in 1 month's time. While I'm sure that you don't *want* to change your Test Date, I have to ask if you have the flexibility to do so? You can think of it this way: what's MORE important - taking the GMAT in a month or scoring a Q45?
Before we can talk about how to "fix" your problems, we have to define them all:
1) Test Takers who focus on a "book-heavy" approach almost always get stuck at a particular scoring level. By working in the way that you have, you've essentially trained yourself to take one part of a pencil and paper Test. Since the GMAT is a computer-adaptive Test, and you have to face the Essay and IR sections before you start the Quant, you're not properly trained for the Official format.
2) From what you've described, you waited the better part of 4 months before taking a second practice CAT. Without taking CATs on a regular basis, you have NO way of knowing if your approach is actually working (and no way to adapt your plan if it's not working). You may or may not know the content - but since your Quant Scaled Score didn't change much, we have no way to know how much you've actually learned (and retained).
3) There could likely be pacing and/or fatigue problems that might be occurring, but we don't have enough CAT-based data to know the extent of these problems.
4) There isn't an obvious explanation for why your Verbal Scaled Score would increase 7 points with no practice. Maybe your overall "thinking" is more organized and logical now than it was when you took your first CAT. Maybe you just got lucky. That type of "swing" in scores is often a sign of inconsistency; on Test Day, inconsistency is a bad thing.
To fix these problems, you need to shift your practice to computer-based resources and take CATs on a more regular basis (1 CAT/week). As such, you'll need to invest in some new resources. There are plenty to choose from, but you need to do more than just extra practice problems. You need new tactics and a product that will force you to use them. We actually have a Course that could help you, but you have likely developed a number of "bad habits" over these last 4 months...and you need to stop doing all of them. If you can quickly adjust, then there's a chance for you to hit your goal. If you can push back your Test, even a little bit, then that extra time would be quite helpful.
GMAT assassins aren't born, they're made,
Rich