I haven't taken my exam yet, but I've been working through the Destroyer and there is a good amount of questions in the book. This works in your favor because the more information you experience in multiple facets, the more prepared you are for the unusual questions. It will crush your confidence the first time through it (I tried to start answering questions when I first started studying and ended up putting it down). I began using it after I went through Cliff's and Chad's video's first to have a basis to start answering questions.
After I went through the 563 bio questions I got just under 60% correct! But as I am going through it a second time I have bumped that up to around 85% correct. Make flashcards and write down everything you get wrong or questions you guessed on. Remember...you don't have to memorize every ounce of information Dr. Romano has given you, but make sure you know the concepts of everything. This doesn't mean you won't have lots of rouge information to remember, but knowing the concepts helps you learn the little details.
Studying for this test is like running a marathon...you won't be able to run the full 26.2 miles the first day, week or month. But if you have a plan and stick to it, before you realize it you are much better at the process of training that you thought you could be. It will hurt, be frustrating and drive you crazy at times but it will all be worth it once you get that great score back. At least that's what I keep telling myself!!