I agree. I've not take ochem, but i have taken a&p and physics. A&P isnt bad, memorizing and understanding. is there a lab component? Its the time commitment there.
Physics? Trig or cal based? Physics is "bad" if you can see the big picture rather than focusing on small components. So I think its doable, but what else do you have going on? Job, volunteering, etc? That would be the deciding factor if i were in your shoes.