What is the rationale for skipping AP chem and taking AP environment? Is that his special interest? There’s a lot of overlap in AP bio and AP environment. Unless he has a special interest in environment, seems a little redundant. Also I am not sure about college credit policies for AP environment. AP chem is probably more recognized.
Are we talking about AP physics 1 or AP physics C here? I wish people on this site would not simply say AP physics because those two classes are very substantially different in difficulty level. I wouldn’t be concerned about AP physics 1–it’s a slower paced version of the old physics B which many schools taught as a first course in a single year. AP physics C as a first physics course along with AP bio would be tough.