I just checked our district's course guide.

+ AP Bio has a year of bio (pre-AP or regular) as a prereq and a year of chem (pre-AP or regular) as a coreq.

+ AP Chem requires a year of Chem (pre-AP or regular) and Algebra II as prereqs.

+ AP Physics B has pre-calc as a coreq. AP Physics C has Calc AB as a prereq, or Calc BC as a coreq. Neither have a physics prereq, although pre-AP physics is an offered course.