Surprise

The secretary from the high school called yesterday to let me know what I'll be teaching this fall. It seems they have scheduled me 3 sections of Integrated Physics and Chemistry, along with my usual World Geography. Since I haven't had chemistry since my freshman year in college, or physics since 71-72 in high school, I am at a loss as to what to do.
I finally spoke with the (retiring) principal, who told me "you taught Biology last year, and that's science." Yeah, but I'm certified in that, and it doesn't have much to do with chemistry, and nothing to do with physics.
So, since the state is testing 10th and 11th graders in both social studies and science I will have pressure from both directions, and my students will be the ones who pay dearly. My geography students will suffer because all my energy will be spent on keeping ahead of my IPC students, who will suffer because they will not have a teacher who knows physics or chemistry. Where do principals get off thinking that this sort of thing is OK?