I'm sorry that you're having such a frustrating time with this test. You are not alone. It does sound like you are burned out, and when you're feeling burned out, it's very hard for your brain to process and learn well. So I agree with you that it's a good idea to give yourself a couple of weeks off.
What I'd like to do is get you ready with a plan—let's figure out what's not working and how to make it better. Then you can take your break knowing that you've got a good plan to follow once your break is over.
I'm going to address your very last thing first: Different things work for different people. If something doesn't work for you, that doesn't mean you are not smart enough! It just means that you haven't yet found what works for you.
It may be the case that your brain works in a way that isn't optimized for standardized tests—that is true for a lot of people. These kinds of tests are mostly about a certain way of thinking / doing things but that's certainly not the only good way in the real world. But I find it interesting that you have taken tons of advanced math; I hear this a lot (that people who've done a bunch of advanced math struggle on GMAT quant). The issue is usually that, because you were so good at school math, you naturally try to use those same kinds of approaches on GMAT math...but GMAT math is different enough that those school-based approaches actually make it *harder* for you to work at a high level on the GMAT.
What that means, basically, is that the issue may not be that you "just aren't good" at standardized tests, but that you need to adjust the way in which you think about / approach these tests overall. You mention that you have done better in the past when you can brainstorm a few approaches and find the best one for you—this is actually exactly what you want to do on the GMAT, too, but you have to make certain adjustments for the time management issue.
It goes something like this:
(1) Before the test / while I'm practicing & learning, I try a problem every way that I can think of doing it. I might do the same problem 3, 4, 5 different ways. I then look back over my work to decide which way is the best way given both the structure of this particular problem and the way that my brain works.
(2) I do #1 with lots of problems and look at the connections between them to figure out what broad characteristics should lead me to choose one solution path over another. When an algebra problem does ABC, then I'll do straight up algebra, but when an algebra problem does XYZ, then I'm going to choose a smart number.
(3) I use #2 to articulate detailed takeaways* in the Know the Code form: When I see algebra + ABC, then I'll think/do DEF. When I see algebra + XYZ, then I'll think/do TUV. Those go on a flash card, with "When I see..." on the first side and "I'll think / do..." on the other. (Note: Don't put an entire problem on the flash card. You will never see that problem on the test. You need to extract the "universal" / GMAT code / heart of the issue that could show up on multiple different problems in future.
*And some of my takeaways are in the form: "When I see a rate/work problem that uses variables, not real numbers, I will check whether I can easily use smart numbers. If I can't, I will immediately guess and move on." In other words, I know how to make the decision to bail, based on my own personal strengths and weaknesses. I'm fine if I can think about rate/work using real numbers, but as soon as these go abstract, I'm going to have issues. So I'd rather just get out fast and spend that time and mental energy somewhere else. (And, yes, I do this personally—even at the 99th percentile. Everyone has to do this on the GMAT!)
What I'm doing with the above is learning how to streamline my brainstorming / thinking process—literally, learning how to think my way through the test. I do that brainstorming in advance and then learn from it so that I can make faster decisions during the test itself, when my time is a lot more limited. I still start each problem by brainstorming, but now I can make that decision about what to do within the first ~1 minute and I'm pretty confident that I'm making the right decision for me, because I've already tried different scenarios ahead of time and decided HOW to make that decision.
Even with that, I'm still never going to have time to ALL of the problems because this is an adaptive test. And that ~1 minute thing is what's going to tell me when I should bail. If I'm ~1 minute in and I realize I *don't* have an idea of what to do or I have multiple ideas but really don't know which one is best...then I shouldn't do this question at all. I just need to guess and move on.
That whole mindset is really different from how we were trained to do math in school. In school, it was more like "if you see this setup, then here's the solution path"—there wasn't really as much flexibility / decision-making involved, and it was never expected that we would just bail and move on. If it was on the test, we were supposed to know how to do it. But that's not true for the GMAT.
Next, let's talk about your practice test results. Verbal first. You went 25 ---> 30 ---> 25. The jump from 25 to 30 was excellent, obviously. The drop back down to 25 is really frustrating. Your post actually indicates what the problem was—you messed up the timing and had to guess on the last 8-10 questions. So the analysis to do here is to figure out where you should have cut yourself off on the earlier problems such that you would have had enough time to finish the test properly. Do two things here:
(1) Go back and identify the 3-4-5-6? questions where you spent WAY too much time (even if you got them right—doesn't matter) and figure out at what point you should have known to just guess and move on. Make this really explicit so that, next time, you'll know HOW to make good, efficient decisions in the moment.
Also, remind yourself of this: You will ALWAYS have to guess on SOME questions. Your only choice is when / where. If you don't make a choice earlier in the section, then you'll be forced to guess at the end of the section, and the GMAT is a Where You End Is What You Get test. So you could have made lots of progress on the content, but your score won't show it because...where you end is literally what you get. If your score drops a lot at the end...that's your score.
(2) Go try those last 8-10 questions again. Give yourself the normal length of time you should have had. How do you do on these when you have normal time? Use that to help inform your overall test analysis / buckets. (When you have to guess on that many, the aggregate data in the reports isn't going to be as useful, unfortunately. Basically, you've got a lot of noise in the data. So you have to go look at the individual problems more to see what you may need to work on.)
Quant
Your Q score went from 44 down to 37 back up to 40. Were you having timing issues on those sections as well? What do you think lead to that drop from 44 to 37? You were able to get back up to 40 on the 3rd test—what was better about the 3rd one compared to the 2nd?
For instance, I had 2 quadratic equations questions in my CAT and answered only one correctly. The average timing was bad - around 3 minutes. However, I know that quadratic equations is actually my strength.
This is where you need to dive down into those specific questions. This area is normally a strength, but it wasn't on this test (6m to get 1 right). Why?
Did they both happen to be very hard quadratics? If so, then perhaps the lesson is that, even on your strengths, they can sometimes give you very hard problems, and so you sometimes need to be willing to bail even on your strengths. At what point could / should you have bailed? Was there any significant difference between the one you got right and the one you got wrong—something you could have noticed WHILE doing them, something that would have allowed you to bail faster on the one you got wrong? If you could have done that, then maybe you would have spent only 4m total—gotten 1 right and saved 2m to spend elsewhere in the section.
Or maybe you solved a problem two ways—the first way (path A) didn't work, but then you realized you could do it a different way, and then that second way (path B) worked...but overall it took 3+ minutes to do both paths. Then, the lesson to learn is "The next time I see something similar, how can I recognize faster that I want to go straight to path B? What are the clues that I need to see to tell me that path B is better?" Also "I did try path A first, so there was something in my brain that made me think that would be the better choice. Why? What kinds of problem details would I need to see to tell me that I really do want to use path A?"
Those are only two examples of what you might find when you analyze the problems—but
something is going on and coule be made better in future, because you spent 6m to get 1 question right. (Maybe you solved the "textbook" way but there was actually a quicker / dirtier way—something that wouldn't have worked in a school math class but that would be enough to narrow to one of 5 answer choices? The GMAT doesn't care whether you found the actual / real / math answer. It cares only that you pick the right
letter, ABCDE. That's sometimes a much easier question to answer.)
So, it really seems that I screwed the quadratic equations questions because of either stress or something else... Also, after test I usually have now problem in solving at least 50%-75% of Quant questions that I answered wrongly in the test.
(The word "now" was supposed to be "no"—right? usually have NO problem solving?)
Yes! It could also be that you were tired out / stressed from the test and so you made careless mistakes that you don't make when you're not taking a test. Mindfulness training can help with this.
Or you are rushing on a problem (because you spent 3+m on another problem earlier in the section), and so you forgot about something or made some other mistake just because you were rushing. This is also where the decision-making during your test is so important—knowing when and how to cut yourself off during the test. You said that you do bail already, but your decision-making on when and how to bail isn't yet as good as it be—because you ran out of time with 8-10 questions to go on verbal. This is where you analyze your overall decision-making in the section (as I mentioned earlier) so that you can figure out how to make better-ROI decisions across the entire section.
Have you seen this?
https://www.manhattanprep.com/gmat/blog ... -the-gmat/Let me know what you think of all of the above. Overall, yes, I think you're going to want to postpone your exam. Plan to take a couple of weeks off. We're going to figure out what's going on, but you're not actually going to study right now—we're just going to get you set up for when you do start studying again.