I must say that after spending about $100 on a pre-exam course, Im glad I did. It was quite challenging. I took pre-exams over and over scoring 100's.. passed with an 82 final. This is not something you can just go take without a lot of prep. You must know an aeronautical map like the back of your hand. Some questions were totally irrelevant, but I can see how they want you to have the knowledge of how the National Airspace works.... study hard my friends!