I completely agree that the test score discrepancy looks a little bit weird... but it's not unusual at all.
Anybody who knows me is probably sick of hearing this, but here it comes, anyway: non-official tests (anything besides the GMATPrep) are inherently unreliable, at least to some extent.
MGMAT's tests are the work of some very smart people who are trying their best to reverse-engineer the actual GMAT test... but
MGMAT's tests just aren't the same as the real thing.
MGMAT's tests differ from the actual exam in all sorts of subtle ways (some of which you mentioned in your post, jppaa), and it isn't unusual to see huge discrepancies between
MGMAT tests and GMATPrep. A 5-point gap on each section isn't crazy at all.
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I wouldn't say they were "harder" from a conceptual persepctive, they just required more steps and calculations. GMAT Prep Quant questions could be answered in fewer steps and in fewer calculations. I thought the RC questions for GMAT Prep were slightly more difficult, but I thought that the
MGMAT articles were longer (and therefore took more time to search for the detail questions).
I think you're exactly right with this stuff, and these are the sorts of things that can bias your score on the
MGMAT tests. I think
MGMAT does a phenomenal job with all of their materials, but it's unbelievably difficult to replicate the GMAT, and it's always wise to take your
MGMAT scores (or scores from any other practice test, besides the GMATPrep) with a huge grain of salt.
My hunch is that you got caught up in the details on some of the
MGMAT quant questions, and that probably biased your score downwards. (Maybe you spent more than three minutes on a few
MGMAT questions, and then rushed into errors on a few other questions?) On the verbal, it's less clear why your score would be higher on the
MGMAT tests--maybe you've used their materials heavily, and you're accustomed to their writing style and verbal traps?
In any case, I would take the GMATPrep result much more seriously as a diagnostic, and it looks like you might want to spend some extra time on verbal in the coming weeks.
And for what it's worth, it also isn't strange for two questions to make a 5-point difference in your score. It's all about which questions you miss, not how many you miss. You could miss 15-17 quant questions and still get a 47; you could also miss 15-17 quant questions and barely score a 30. It's just a question of which questions you miss, and where they fall in the exam.
I hope this helps. Good luck with your studies, jppaa!