John: The books Mike mentioned are definitely worth downloading and studying. I would also echo what Darryl wrote, and expand: it is good that you are studying in advance, but it's not necessarily a good idea to "get the written test out of the way" before you even start flight lessons. Once you get to do some flying, and discuss various things with your instructor, you will have a deeper understanding of some of the things asked about in the test. That's better - and easier - than just trying to memorize the right answers, as some of the online test prep sites allow you to do. Don't put the test off TOO long though, so it won't delay your flight exam when the time comes.