I didn't buy any of the IAAP review materials (they were a little too pricey for me - my company doesn't reimburse for that stuff).  I bought a bunch of books through Amazon - I bought the Management Review book and the Business Law Review book, Economics in One Easy Lesson (I don't recommend that one - it was interesting and informative - but it didn't really help with the exam), and an Accounting book that was GREAT.  



Accounting is NOT one of my strong points, but this book (the title is something like Accounting from the Lemonade Stand) was terrific.  Not only did I learn what I needed, but I actually COMPREHENDED it!!  



I'm keeping the Accounting Book for my son (when the time comes), but if you would like the Management and Business Law books, just let me know.  There's a lot of highlighting in them, but they are in very good condition.



I definitely would have focused more attention to the Office Systems/Technology portion - there were a LOT of magnetic storage and mainframe questions that I was not prepared for.  We had two people walk out after that portion - and they were there to sit for the whole test.  



Good luck to you whatever study method you decide on!!



Sue