I agree that taking Physics 1 before Physics C is a good plan, unless the normal progression at your school would be non-AP physics followed by 1 or C.
Our school offers on-level, 1, 2, and C-Mechanics each as full-year classes, and does not offer C-E&M. Suggested progression is on-level followed by 1, or 1 followed by 2, or 1 followed by C, depending on math background / personal interest.