I just want some more recommendations on books that contain practice exams, before I spend any more money!
So far, I've completed Firefighter Exam 4th Edition by Learning Express (4 tests; very helpful to review material, but the tests were fairly easy.)
And Barrons Firefighter Exam 6th Edition By James Murtagh. This was a very helpful book, and I found the practice tests to be very similar to what I've taken in real life.

However, I've gone through each of these practice exams 4+ times. Time for some new material, as I've got Denver's written approaching.