The only possibility I would have for you would to maybe take out AP Physics and put in AP chem if you are very interested in chem and have already taken a physics class. Both AP Physics and AP chem are both hard, but at my school (very competitive public school) only the smartest and most devoted students take AP Chem. It is regarded as the most challenging course in the school.
Otherwise, I would leave your schedule as it is. Do not take both physics and chem. Its going to be tough enough as it is reviewing for subject tests with the course load you have planned out.