This is an unfortunate situation but one possible workaround is study groups. I had an experience where a handful of classmates formed a small study group for a

This is an unfortunate situation but one possible workaround is study groups. I had an experience where a handful of classmates formed a small study group for a difficult class with subpar professors (there were two). We did the homework together, walked through the problems, and as a group we helped each other understand the material. We all did very well both on the homework (as you would expect) and on exams and finals. The rest of the class did not.