Help-Please! Little confused on what books I should purchase for 640-802. I understand the 801 will expire in Nov. I am promising myself that I will pass exams by X-mas, so I will likey be taking the 802. Probably doesn't make sense to purchase 801 books, right? Also, how many of you folks have been successful doing 100% book study compared to attending a class? My schedule won't allow for anything other than book study. Need advise! Thanks!