MRD, I really do wish there was something I could do to help you with the German and Statistics classes. Have you looked into finding a tutor, like queenb suggested? Sometimes some of the other folks in class might be willing to team up for extra study time, or you could barter your knowledge of history for someone that knows statistics backwards and forwards. Put a help/want ad on some of the bulletin boards.
Something I tried when getting my undergrad degree years ago and running into the same problem of trying to make appointments with the instructors: I marched up to my math instructor and said, "Hi. I'm sure you've seen my puzzled face in class and heard the confusion in my voice when you call on me. I am going to come by your office this afternoon or tomorrow at the latest and I need you to help me understand some of these equations and theorems. I'll bring the coffee, would you also like a snack of some kind?"
It worked, I went by that day and we spent about an hour going over some of the problems I was having. I took cookies.