haha...i know this reply is coming in late...but its like a dream come true for me to give advice on biochem shelf (sad...but true
)....anyhoo, i did quite well on the shelf, and highly recommend lippincott's. i used the pre-test as well and found it most helpful for the metabolism and integration of metabolism section. Genetics is decent. Ignore it for the molecular bio section in my opinion. Though the questions are super duper hard (i missed half of them), the explanations are quite well written, and the same topics are tested in different ways....so though the topics are hard as hell, they get drilled into your head....
Lippincott's is a big book (by my standards...hehe), so if you havne't used it so far, it might be overwhelming to read it cover to cover at this point. However, I would get the 3rd edition anyhow, and look at the diagrams, and do the few questions that they have int here....frankly speaking, if you know lippincott's inside and out, you'll kick butt on that shelf! the diagrams are classics, and might help clear up and integrate many of the topics.