Personally, I really like outlining and taking notes from textbooks. Just reading over what you need to know isn't going to make the information stick in your brain, and you can add things from your notes to a cheat sheet later on. Taking practice tests (almost like a pre-test) to know what you need to study is another useful tool. Make notes to yourself as you go, and see what you're really struggling with as opposed to what you're just unsure about. Ultimately, think about how you study for a test in class! If flash cards help you, make a Quizlet or something similar. If you need to study with someone, then meet up with your partner (which is something you should do frequently anyway). If you have access to teachers with experience in biology, you can always ask them for help too. If you have an area college, you can reach out to a professor and see if they'd be able to study with you as well.
TL;DR: Do what works for you. Plus - Google is your best friend. If you don't know what a word means, look it up and write down the definition.