I am looking to buy the kaplan blue book, but I was wondering how much of a difference there is between the 2008-2009 and the 2009-2010 version. On Amazon the difference is about 100 dollars between the two items. I can't believe they are all that different, but the outrageous difference in price makes me wonder if the newer version is that much better for 2010 test prep. Any idea if it's worth the extra hundred bucks?