In general, traditional vocational programs (not nursing specific) were designed to have few requirements beyond a GED/high school diploma and possibly a placement type test. You basically enrolled and the program taught you everything you needed. I'm not sure about the specifics of LVN/LPN programs, but it wouldn't surprise me if many of those still follow the traditional vocational type program. Which means you'd get some anatomy, basically for what you'd need to learn but maybe not as in depth as if you had to take AP 1&2.
Anyway, I wish you luck and I think you shouldn't stress out too much. Study, go to class, ask questions, use office hours, and feel free to ask questions here :)