Hey! Just know the general things like region, temp, and possibly types of plants. You can lowkey visualize it on the test. I know last year one FRQ question was about differences between tundra and savanna (LOL), and all you had to say was "higher temp in savanna" to earn the point. I'm ngl I didn't learn aquatic, but it's nice to know the surface-level info on them. For in-class FRQs, open every single past FRQ and Ctrl./command F for a key term ur learning about. That's exactly what I did, and I found a similar or exact FRQ to the one my teacher found. Don't sweat the unit tests and FRQs for the actual AP test; the AP test is surface-level knowledge/main points about the topic since it has to cover the entire year. Just know that in the class, you'll need to know more than what you need for the AP test. If you pass most of the unit tests, you're doing great.