The OP made several good points, but I do not know about a monkey being able to pass A&P. However, if you got a good grade in that class it shows that you have good study skills and are able to learn large amounts of info. quickly. Both of these skills will help in med-surg.
Also, A&P is the meat and potatoes of your nursing classes. If you have a good understand of the human body and how all of the systems work together when the body is health it will help you to understand the disease processes. It will also help you to understand why we do the nursing interventions that we do. Many times in nursing school
just having a good understanding of A&P helped me to work through the questions to come to the correct anwsers.
The OP is correct that a nursing test is like no other test that you have had in your general ed. courses. You will not always know the anwser to the question because a lot the questions will force you to think in a totally different way. However, if you have a good solid understanding on how the human body works, and some common sense, and you study hard, you have a good chance to do well in nursing school.
Good luck in school and do not let what others say discourage you. Embrace the learning process and learn everything that you can in every class.