I completely agree! I mean I never tried Kaplan but PR
Reading Sections are just bogus. There is a reason their explanations are so ambiguous, because most of the answers don't make any sense! I will sit and say "How the heck is that the answer?!". And then I get 720-760 CR in the BB.
I think doing PR
Reading will not only hurt your score but drive you crazy! I was ready to cry when one test I got 760 and then the next day got 630.
I would order the Collegeboard book if I were you. They are the people who make the test thus it will be a more accurate indicator of your score on the real test.
From what I have heard people's score on the actual SATs vary +/-50 from what they get on practice tests in the BB.