Hey therock - hope you don't mind but I took a look at your test just to give you a breakdown of how it was scored, and everything looks pretty good. A quick rundown:
-By answering 8 of the first 10 right you put yourself on a pretty elite path early on. The system had you in the 99th percentile after question 10 (and of the two you missed - that question about the SUVs and cars...almost no one gets that one right (around 10% do) so missing it doesn't lower your score by much. And that question about mangoes is one of Karishma's gems...that's another one that people really struggle with, so missing it doesn't lower your score too much either. Especially since, by being in that elite zone to begin with, you were answering 2 questions right of that same level for every 1 wrong, which kept convincing the system that you belonged at that elite level.
-One of your quant misses was an experimental question, so that one didn't touch your score.
-Four of your misses came in the last dozen or so questions, and by that point the system had a pretty good read on your elite level. One of them (Jennifer passing the test) is another of those that almost no one gets right (that's one of my favorites for teaching Data Sufficiency though). Since you balanced those with correct answers the system didn't punish you too much for it at all. That run toward the end was essentially what took you from a 51 to a 50.
-As far as scoring goes, too, keep in mind that a true computer-adaptive test like this uses data from the entire pool of students to assign question difficulty ratings and to compare your performance with that of others. The number you get right or wrong is really only relevant in comparison with how other users of varying ability levels do on those questions, too. So what I actually like most about this test you took is that you got a very authentic experience close to what you'll see on test day if you're poised to score well into the 700s - you WILL get beat up by hard questions and you WILL miss more than a couple questions. A computer-adaptive test is designed to serve you questions that give it more information about your ability level, so once the system sees you as "very, very capable" it's not going to waste its time serving you a bunch of moderate-level questions. It wants to see just how elite you are, so it serves you questions that challenge its current assessment of you. Getting 3/4 of those top-shelf questions right is very, very good, and that's about what you did. So I'm confident that the scoring was accurate, but maybe even more importantly I'm happy that the experience was accurate and beneficial for you.
-Here are a couple articles about Item Response Theory and Computer Adaptive Testing that may help shed a little more light on how the scoring works:
https://poetsandquants.com/2013/07/21/the-mystery-of-gmat-scoring/https://www.veritasprep.com/blog/2013/07/gmat-tip-of-the-week-stop-counting-rights-and-wrongs-in-your-gmat-practice-tests/And if you want to take another of these tests for more experience with an adaptive test at your ability level, send me a PM and I can add one more to your account.