Lippincott's was ok, but not nearly enough for the PhDs that were teaching us, so Lange's Medical Biochemistry is good. That should get you through tough spots. If all else fails and you can't get through all of the reading before the test block, pick up a High Yield Biochem and BRS Biochem. They are a very concise review that are best used after reading your primary text and lecture notes. (For the Boards: kaplan Notes and Lippincott's) Hope this was helpful.
---BeeGee