Do you have labs for A&P, Bio, and Chem? If all three classes have labs, you might want to consider dropping one of the lab classes. Science classes with labs are really time consuming, but you can always go to class the first few weeks, talk with the professors about your aspirations and concerns.. and drop one of your lab classes if you feel that it might be too much to handle.
I'm in the same boat as you too. I just graduated with a BS in Business from Carnegie Mellon and want to get into an ABSN program as well. I'm trying to finish all my prereqs in 1.5 years so I can hopefully start nursing school
with the Spring 2013 cohort. I already took Stats, Bio, and Chem in college so this fall I'll be taking:
1. A&P I w/lab
2. Microbiology w/lab
4. Biomedical Ethics
5. Developmental Psychology I
I can definitely say I'm worried about taking A&P and Microbio together...