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For those of you who are wondering the difference between TPR's 2015 book package vs the pre2015 ones. They are almost identical. Most chapters are literally word-by-word identical. There are slight differences here and there, like the pre-word. The bio book is much bigger but I didn't notice any discrepancies from the old book when I was flipping through it. I'm sure there are probably chapters added to the new bio book that would have been evident had I took the old book out to compare. I ended up returning it because there was no way I was going to pay over $100 for a set of books that I pretty much already owned. I think the psychology/sociology book is worth getting though because it's new. Hope this helped