This is a good sign for someone intending to take calculus a bit early.
Personally I think that I would take chem first. You could ask a science teacher or your guidance counselor what they think. You will most likely also want to take a physics class at some point unless you already did this.
Mostly I would drop the one that you are the least interested in. For me it would be APUSH. However, math, science, and computers were the things that I personally liked the best and did best in.
The main issue here is to do what is right for you.