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Once reaching school's 75th percentile, does it still matter a lot how much above the 75th LSAT/GAP percentile you are?

For example, Harvard's 75th lsat percentile is 175. Does it still make a big difference for admission between a 175 and a 177?

There are diminishing returns the further you are over 75%.
But a 177 is still preferable to a 175.