if you have more knowledge about multi tier architectures, NFR's, and other skills required for part 1, you can just keep practicing mock-up exams, then you should be fine. SCEA study guide (Cade) is not enough. Also search web for more questions.
I "only" read Cade. See my signature for links on what I read. You'll notice that I read most of the books over the years before I decided to take the exam. There isn't a shortcut to learning. And Cade isn't enough unless you have the background knowledge already. What it will do is show you what areas you need to read more on.
What's the hurry to take the exam? If you already know the material, you will be ready quickly. If not, you aren't ready to be an architect anyway.