Practice Test confusion

<p>Hey guys,</p>

<p>Does anybody know exactly why they give you score ranges for the last 7 practice tests in the Blue Book? I know the first 3 are supposed to be ACTUAL PT's and the last 7 just made out of ACTUAL QUESTIONS. But does the latter fact not make them as authentic as the first three? Or is it about planned variety of difficulty? I would like to know because I think I actually did kinda better on the first 3 tests. Was that just coincidental?</p>