Hello Tam,
I am dental student about to begin the first year. However, I feel I can give you some information. From what I have heard, it is easy to pass if you stick to the dental decks. But, if you are shooting for a high score for a specialty, I would recommend talking to a Kaplan organization near-by for their study materials. I see going back to your original texts as futile and time-consuming. They are good for questions you cannot answer on the dental decks. Hope I helped. Tell me how it goes.
Sterichind