Mine is a similar case. I too constantly scored in lower 600s on mock, but on real gmat i scored 580.After much introspection, i realized what happened. It was when the mind was tired,when i was getting constantly bombarded with new questions, when the time was ticking like a time bomb and when panick had struck for some reason, the brain stopped thinking effectively. On the contray,in ir i scored 7 out of 8 something i had never done earlier. The reason behind this was that i had written a big
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