You can do open book on one computer, too. :-) The quiz for the customer end of the phone shop is EASY. The one for the non-customer seems to be the one giving everyone fits. I did not take it, so don't know-but I did the customer one and and both the shop and the quiz were super easy, and worth the $11.
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“Lying in bed would be an altogether perfect and supreme experience if only one had a colored pencil long enough to draw on the ceiling."
~Gilbert K. Chesterton