Seconded, Gertrude.
The purpose of the exams is to test your knowledge of the theoretical aspects of aviation, not to learn the entire databank's answers from a website, that is all but cheating by any other name. Oh, I know this may be "the way it's done" nowadays, but it doesn't make it the right way. It certainly isn't doing the candidate any favours at all by denying him the knowledge he ought to have but has circumvented.
PPL knowledge is pretty simple anyway, why bother?
As stated above, the text books cover the subjects to the depth required so suggestions of learning Young's Modulus and Astro are just very silly and unhelpful indeed.