I second campbells, I have both campbells and schaum's, here is my synopsis:
campbells - excellent tool, easy to read, easy to pick out important info, I have not seen a single practice question anywhere that wasn't one of the topics/key words that are in bold in campbells
schaum's - convoluded and hard to read, I personally would not recommend, also has useless explinations for some stuff that seems like a waste of text, the only area I would recommend this as a supplement to campbell is for systems of different organisms, such as how certain organism phyla/classes excrete, circulate, etc.