Absolutely positively without a doubt - do not try to get ahead by studying outside materials. While the training at Colgan has its issues, you're better off learning what they want you to learn, when they want you to learn it. As long as you spend a little time every night in ground school reviewing what you learned and reading what you're going to do the next day, you will have no problems with the systems test, and by the time you get to your PC, anything you read before ground school will probably be forgotten anyway.

Feel free to ask me any questions, it'll help me keep some of that stuff fresh too.