638 Core.  Not too bad - couple of questions that totally threw me but the rest were right on.  Read Mike Meyers book, skimmed the Exam Cram Book, took the Exam Cram practice test as well as their two core tests in the practice test book they sell.  Just go to the bookstore, get a cup of coffee, open up the book and take the two tests - jot your answers on a 3x5 card.  The book is certainly not worth the $20 they want for it.  Also took some of the shredder tests - pretty good. Also Phillip Evan's study guide(on the web) - REAL good idea to check that out thoroughly.  Like some others here - my test ended after question 20 or 21, so even though I knew I missed some of the questions, I hit enough of the others to justify a passing score. Pre test diet - 5 egg whites/1 yolk - scrambled                       6 oz seafood pasta salad                       500 mg Vitamin C                       300 mg St John's Wort                       10 oz gourmet coffee                  16 oz filtered water Is this bodybuilding or computer certification??? Seemed to work for me Good luck to you all.