Since those are very popular/required courses that are fairly huge, you are likely to get textbooks second hand for all of them unless a new edition is published. However, before that, I recommend waiting until your first class. Your professor will usually state whether old texts are acceptable, or how often the text will be relied upon.
They might not respond to a 1000 emails from a 1000 first years about which edition is best because that may be answered in class.
I would not stress out about purchasing textbooks right now. Enjoy your last few weeks of summer, and start studying when school begins. It's easy to burn yourself out in first year by stressing out too much about the workload, which is completely manageable and feasible if you allocate your time carefully and focus when you are studying.
Unless your summer is super boring and/or you really enjoy reading scientific texts for fun / you really need the extra time, then I would not recommend purchasing things early and reading them too early because you might be well ahead of the class and thus not find the lectures useful, but may end up missing important points that your text readings did not cover.
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Emma Ali
Honours Life Sciences
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