The library is full of free resources people forget about — encyclopedias, reference librarians who will literally do research for you, study guides. And the librarians are thrilled when someone actually asks for help. Don't be shy about it.

Flashcards still work. Old-fashioned index cards. Make them yourself — the act of writing the card is half the learning. Quiz yourself, shuffle them, put the hard ones in a separate pile. Low-tech but it gets results.

Strunk and White's 'The Elements of Style' is a tiny book that will make you a better writer almost overnight. Every student should own a copy. It's cheap, it's short, and the advice in it never goes out of date.

Teach it to someone else, even an imaginary student. If you can explain a concept simply and out loud, you understand it. If you stumble, you've found the gap you need to study. They call it the Feynman technique and it really works.