Whether AP science is harder then AP math or english is subjective. I know some people who think AP calc BC is harder then AP Bio. Umm you should only take it if it relates to your major. If you're majoring in science, then you'd want to take an AP science. The other reason you would take it is to get into highly selective colleges, like ivy or maybe something like NYU. If your good at maths, you might as well use it in AP physics. AP enviro is the on the easier end, you could self study that if you don't want to take the class. If you self study then you can take the may test and get college credit. AP physics you'd need to take the class on, as i've heard is the hardest science. But a few people say bio is harder, so physics would take more time then enviro. The harder ap classes are much more valued by highly selective colleges, some colleges don't even give credit for some ap's like AP Macro/Micro, AP Language & comp, ap enviro because it's not needed and they think it's too "easy". But whether or not it's easy, if you feel like you want to take an ap science but don't want to spend too much time in it and get overwhelmed, then go for ap enviro. Then you'll have all ap subject bases covered and ap enviro is accepted by a lot of colleges.