It depends, some people maintain the same edition a while longer. Some new editions have merely slight changes. If it's a courseware, don't buy it off of someone else because I find that coursewares are never the same. Also, once you're more experienced in book buying at Mac you can definitely buy them before classes begin. I always buy them before the first class. However, in first year I accidentally bought the wrong book-- luckily, I was able to return it because it was still concealed in its package.
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