I use the Sladyk AND the Johnson book and both of them almost guarantee that you'll pass the test (I mean this literally, the Johnson book actually said guarantee to pass)... I studied using these two books. I started with the Sladyk book, and went through EVERY question, write all the choices down, then corresponding content. I didn't really use this book as a prep test, I used it as an outline. (Yes, the whole book).
I still have these two books, let me know if you want them...