I recommend that you do not spend your time learning the answer to the specific questions. I will not ask these again. So trying to memorize the answers is useless. What you need to work on are concepts that are represented by the questions .If you can't answer question you need to learn the concept, not the answer to the question. So be careful how you use the annotated exam.
I recommend that you estimate your understanding of the material by actually taking each exam under exam conditions--no reverse engineering of the answer. Then look at the annotated exam only if absolutely