[albutr]

Even better is to look up the undergrad/grad curriculum from a university and then look at the course webpages (many universities still publish their course materials available to anyone who has the link, without needing to login through canvas or a university portal). Pretty often you can get access to homeworks/exams and solutions, lecture notes, etc. in addition to seeing whatever textbook they're using.

Plus, the added benefit helping limit "analysis paralysis" from having too many possible texts to choose from yourself, just pick whatever was standard for that particular class.

[knzhou]

This is a great point. Out of all the ones I've looked into, I think MIT has by far the most complete public curriculum (because of MIT OCW), but Cambridge and Oxford are not far behind, with excellent lecture notes and problem sets.

[albutr]

Agreed, at some point I've used something from all three of those and they're all great! I've seen a surprising amount of great stuff from smaller universities too iirc, if you google around.