Did that happen to be Front Sight? When I lived in CA, a friend out there went to a bunch of their courses.
I'm not sure on class size for the advanced class. I know when I took my basic CCW class, there was about 40 people. All 40 did the classroom portion together, and then the first 20 did the shooting portion the same day and the 2nd 20 did the shooting portion the 2nd day. I was thinking this was limited to 20 but can't find anything to back that up right now.