Comair's training is excellent and you will most likely do just fine without additional studying prior to class. If you want to try to get a jumpstart on your studying, I recommend a study guide from one of our CA's, Chip Wright TheWrightFlyer@aol.com. It is very helpful for systems and Comair's limitations and some other general info on the CRJ 40/50. The study guide is put together quite well and sells for around $30. Chip is also an author for AOPA PILOT which for some may or may not be a testament to his writing skills. He does advertise his study guide someplace, but I can't remember this website so just use is AOL email and he'll get back to you. Hope this helps!