teaching - What to do with teachers who think their subject is "extra special" and gives students too heavy a load?

I've had my fair share of teachers who give so much more load than the previous teachers of the same subject. A whole extra project, much more papers, or exercises, etc.

The bigger problem is that there comes a time where in a single semester, several of the teachers think this way, and MOST of them give an extra project/exercise EACH, on top of the current curriculum projects.

This strains the students too much.

How should a student approach these types of situations?