Great list! I’m guilty of many, but I also follow quite a few. Some I will try to implement, some are not for me. The list will be individual for everyone.
I would love to expand this one: Don’t go to school because society tells you so!, to don’t do most things just because society tells you to (within limits of course). Think through everything you do and make a deliberate decision of whether or not it will be good for you. Not only in terms of productivity, but also in how it will make you feel about yourself.