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Not needed in Canada. The drinking age is 19 in most of the country, and 18 in Alberta, Manitoba, and Quebec.
“There is no substitute for reading the book preferably before class discussions…”
If you keep ahead, then you know a little bit more at the beginning of each class, which means that you follow the class a bit better, which means that you get further ahead. This works just as well in math classes as anywhere else. I didn’t learn this until graduate school.
“Don’t take a great bike to school. Whatever kind you take, lock it.”
Also don’t just lock the front wheel or the rest of the bike will disappear. In Amsterdam there is a small company that specializes in taking a brand new bike, and making it look like garbage without harming its function in any way. This is of course to deter thieves. There might be an opening for similar very small businesses at most large US universities.