<p>True, but I suppose that is why colleges will allow you to take the test multiple times, to figure in for that discrepancy. If you get a difference of two more than once, than it seems that one reader is very generous, and the other is not. Or, one reader is very harsh, and the other is not. Either way, you will not get these two graders, so the probability it will differ by two on different tests is slim.</p>