I personally did not like School of PE. They are great at getting you ready for the morning exam, but not that great for the afternoon depth portion of the exam (WR). I used them the first time around, did awesome in the morning(39/40) and bombed the afternoon portion(13/40). They do have recorded sessions, so if you miss a day you can go back later in the week and watch the class (that was a plus as I was working most weekends the lectures were schedule for)
The second go around, I looked at my diagnostics, and bought a three month pass to the exam cafe at ppi2pass.com. They have options that allow you set it up like a timed exam. There were a few typos in their problems, but for $65 you cant really complain. For exam day, I brought the orginal note from school of pe, I had a bind full of solved problems from ppi2pass, and about 6 books (CERM, Metcalf & Eddy, Water Treatment Handbook, Environmental Textbook, Open Channel Hydraulics, by Chow, and Groundwater Hydrology)