It was easier in regards to feeling like I was only studying for one test. If you go general I'd recommend purchasing the exam reference book. Since you'll be flipping through a lot of different sections...you'll need to be efficient in it's use.
My apologizes, I thought fail letters came with diagnostic scores so bigger envelope. I'm not sure how they mail them to be honest, but if it was last name I'd definitely be in the 1st batch.