I've also noticed that in most cases, if the quant and verbal score are in the same percentile range, then the overall score will be in the next percentile range.
e.g. In my real GMAT I scored an 82 percentile in quant and 89 percentile in verbal. Since both the scores are in the 80 percentile range, my total score was in the next percentile range (92 percentile)
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From 650 to 710 to 750 - My Tryst With GMAT [Experience Thread]