I have just taken my commercial written, as of May 2005, I guess I am a firm believer in taking an ASA Book and openining it up and going through and looking at every question and if it is a calculation keep doing it until I get the correct answer. I normally like to go through the book 2 times and then after that I like to go online and do some of the practice tests. I guess we all have our own ways of studying up, for me this is the most effective, also it helps you save some $$ but best of luck on your test.