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What makes sense is that you'd get Q90 only if you got a set of relatively hard questions correct. For instance, if you got all questions correct the first time through, you'd get Q90. Or possibly, if you initially missed a question toward the end, say question 19, and still got hard questions all the way through the section, and then corrected your answer to that question, you'd get Q90.
Yes it makes perfect sense that you can score 90 after correcting a hard question, but not after correcting easy questions.
That happened with me in the Verbal section of GMATPREP-1: I corrected question 22 (which felt really hard then) and the score was 90.
The GMAC has always said, and it's stated in every Official Guide , that the score depends on three things (see the attached image):
1. The number of correct answers
2. The difficulty of the questions (harder questions contribute more to your score)
3. How many questions you answer (for the unanswered questions penalty)
This scoring must be the same still, even if we can now correct some answers. Each correct answer, corrected or uncorrected, will still be weighted according to the difficulty of the question.
The test taker who made mistakes in easier questions will have seen more easier questions. This test taker cannot score as much as someone who did not make those mistakes and saw only hard questions.
There's nothing unfair about this scoring. It's how the computer adaptivity works.
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