Oh that ain't nothing, you need to go through Campbell's for general bio stuff and Lehninger's Biochem for all the metabolic pathways.
In all seriousness though, just stick to Cliffs and KBB. If even after those you are scoring like 16-17 in top score or other practice tests, then do Schaum's. I used only Cliff's didn't even go through KBB properly. I did use the aforementioned textbooks for reference, but only rarely.