Is it like a really easy AP? What is its difficulty compared to other easy APs like AP Psychology (which was very easy for me, got a 5 with just studying the night before)? Should I take it if I already have 7 other AP/IB classes?
If you got a 5 in AP Psychology, I’m sure you’d get a 5 in AP Environmental Science. To some extent it will depend on how your teacher teaches the class, but in general it is much easier than the other science AP courses. You should only take it if it truly interests you, or if you need it as a weighted grade to help boost your GPA or keep you within a certain ranking among your peers.
AP Environmental is similar to AP Psychology in rigor and concept difficulty. Pay attention and you should be good!