Translation of Telefonanlage

So you have taken a German course in the Ghoete Institute. Well, I certainly learned something with you, and your German is already a lot better than last time. I think we really did it.
Once you've put it online, I'd like to check the text for eventual inconsistencies. Let me know how it goes. So that I can review it as well. Let us be in touch towards our next study session. I will be there on Wednesday.
The course was a bit tough because the teacher always gave lots of homework. We were upset about his behaviour. He was very arrogant towards all the students. It was simply no fun to study there.