I just noticed this same thing. I have Kaplan book and practice papers and BPP practice papers and all the information seems to differ. I had assumed that Kaplan would cover the entire syllabus but it seems that each provider has only the information that they believe will come up in the test. My plan is to study everything (Kaplan, BPP and opentuition) because I would rather be over prepared. It would be good if somebody who already sat the exam could assist with which information is relevant