yes, almost everyone gets about 1/2 right and 1/2 wrong. Once you get above 700 or below 300, it starts to skew a bit - but it is still the case that you will get a lot of questions wrong. The algorithm is NOT "percentage correct"-based (the way paper tests are scored). Even if you score a perfect 800 - you're getting questions wrong on the test.
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Stacey Koprince
GMAT Instructor
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Manhattan GMAT
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