Law was like a 1 or 2 credit class and it wasn't very in depth. It was very basic; just enough so you didn't embarrass yourself completely on rotations.
If you wanted to pass the MPJE, you learned it yourself (the school was pretty clear this was the case and we didn't have a lot of failures on the MPJE, though you would have failed without self study). It's not hard to learn on your own though.