I wouldn't bother with undergrad course in this. It won't really help you learn it the way you need to learn it now, so why waste your time?
As far as preparing, read the cases, read the notes, read the supplements. Take notes while you read. Be able to talk intelligently about the case without having your casebook open. Put your brief and notes in a way that makes sense that if you were to read aloud from them verbatim, the prof and other classmates would understand it. Write in a conversational format. If it is written in a way that makes sense in that regard, you don't have to think when you are cold called. You can read your brief verbatim and be fine.
Oh, and when the prof calls your name, please, please GOD, do not ask him "do you want me to start with the facts?" as ALL my profs have said, multiple times, "the facts is a good place to start, yes"