Not sure what books you are referring to but save your money. If you think those sections in BioChem are important (they definitely are) I would buy just that book. They have them for dirt cheap online from libraries that closed or students that are done with them (ebay is your friend). But for the most part, most if not all topics haven't changed in that two years so I doubt it is worth buying them all. Also, do not think buying the Psych book is worth it, as most people that do well on that section pretty much just use the Khan Academy doc + premed95 Anki deck.