<p>In your place I’d do physics, but I just checked the Princeton admissions requirements and they do not require it. They only require 2 years or more of laboratory science, but “including physics and chemistry for students interested in engineering”. Are you? Do you have any idea what areas you may be interested in right now?</p>
<p>If you do change your mind, you still have plenty of time ahead to change your schedule, so I wouldn’t worry unduly about the physics v. AP Environmental Science question right now.</p>
<p>The number of math credits you get doesn’t quite matter (as long as you have enough to graduate high school). I think it’s more about how far you get along the math track.</p>