A&P is extremely detailed, but it'll help. Before I took my DAT, these are the Bio classes I had taken (in no particular order):
Gen Bio 1 & 2 - obviously
Genetics
Cell (& Molecular) Biology
Evolution
Brain Biology
Biodiversity
Cellular Physiology + lab
Plant Physiology + lab
Biochem+ lab
Microbiology + lab- Lower Div course
Animal Biology + lab
Human Anatomy
I did score a 25, and to be honest, all of these classes had helped. What sucks is that they're so specific on one subject, and there really isn't one course that focuses on all the "upper division" material you need from each of these classes. The ones that may have helped the most were the ones in blue. In fact I'm taking Human Physiology right now for my second minor, and I'm sure this would have helped too. But, I hope this list helps you a little in deciding what classes to take!