The Gleim CD is in exactly the same format as the exam on the screen and provided you follow the well researched and designed study method (which most people don't as they think they know better) it is very easy. Don't forget that the questions are THE exam questions.
Once you have studied through the questions just do the practice exams every day and you will easily pass. There is NO need to read a book or in fact to write anything down. I did neither and got 96%. Leave the flight planning questions till last as you can pass without even answering them. There are no trick questions like the JAA/CAA.
Plus you get three hours to do the exam. It can be in just over an hour with practice.