bb
Ugh. Sorry about the quant being too difficult. Running into a wall on the GMAT is to be expected unfortunately, but it is a good sign if you live to live the tale that is.... I wish we could really tell you or give you better advise.
What were your practice scores? What questions did you find difficult on the GMAT? What did you get stuck on? Any particular theme or they were like nothing you have seen before?
My only suggestion 3 weeks out would be to retake without ANY SIGNIFICANT prep and just see if you can push the score up. This happens quite often - you get a diff set of questions and better luck and you can walk out with extra 20-40 points.
By the way, did you get a 710 or 720? If 720, you likely had a strong V42/Q46. If 710, then they were weaker.
I had a 710 so they were weaker :/
Practice scores were 690 to 760 on the OG mocks (with a 770 on a mock 1 repeat). But my higher scores were on the earlier mocks so I've been trending downwards for a while.
I found most of the quant questions challenging tbh. I knew what concepts they were testing but I had to apply them in new ways. I feel like the style and mix of questions have evolved since the first mocks, OG question banks and books, and since I've mostly practised with those, I was caught off-guard. My first few mocks felt like 50% ratio/percentage/probability questions for instance and I don't think I got more than one ratio, probability and work-rate question in the real exam. Not a Venn diagram in sight

Not even a square root. All these were things I was really focusing on towards the end because they felt so over-represented. There was a ton of mean, median stuff which I know conceptually but applied in new ways that I hadn't come across before. So I was spending time inventing things that I should probably already have known in the exam. Basically, I felt "under-practiced" in certain topics. Also, so much panic! I would solve a question for 1 minute, hit a wall and then realize that I had missed out a variable at the start

Frustrating but maybe fixable.
I appreciate your advice about not doing any more significant prep but I think I should try and plug a few of my holes. I'm feeling surprisingly hopeful about this and I think I just need a little tweak in tactics with going topic by topic. From what I have seen, I think I know enough theory. I'll be drilling down on questions for the next 2 weeks and taking the last week off.
And if push comes to shove, 710 isn't terrible and I have other things in my profile to work with.
I will post the ESR once it's available.