PWNed by my Practice Exam

Our Crim Law Prof sent out an email today with the model answer for our practice exam we took Wednesday. From the answer he sent I can see that I am going down the right road, I got most of the charges dead on and made the correct arguments. however I can see that I am not going into nearly enough detail and making my answers and thorough as they need to be. I hate not knowing what to expect and how exactly to nail a question. As someone who had an easy time of it in undergrad making good grades, figuring out what the teacher wanted and giving them that, law school is making me feel inadequate and moronic. I know I am neither of these things and I possess what I think is a good legal mind. I just don't know how to get that across on my paper. Ugh! I can't wait until this is old hat and no longer the issue it is now. Am I a 2L yet??