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I don't think that's true. The value would be hard to prove. For example, if GMAT knew you were weak in probability, but you brushed up on that this time, so how many probability questions do you get?
Also, this would be unfair towards other applicants and the big message from GMAT is that it is able to accurately evaluate every applicant, not make it harder or fail you (even though it feels that way quite often). If the word came out that GMAT was not fair, schools would drop it and choose GRE instead since they want to be fair and evaluate everyone based on their abilities, not past history...
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