Bad habits

I'm beginning to realize that students can pick up bad habits from past sub-standard teaching. I have some third level students who are no further ahead in skills than some of my first levelers. I had bigger expectations for my third level classes but now I'm wondering about having to readjust my whole semester plan. As I started with the basics for a bit of refreshing I found out just how far behind some of them are. My largest Carpentry 1 class is my worst on the discipline issues. I'm spending a lot of time keeping them under control. I have a Storage building project all lined up for one of our teachers but I'm afraid I may end up doing most of the work myself. I'm considering telling the teacher that we're not going to be able to do the storage building. I'm glad that I haven't already excepted the money for our account and had materials delivered! Send me your thoughts.