Why Teachers Quit? Student Behavior. At least 30% of new teachers quit within 5 years, maybe more! Why do so many teachers quit? Teaching is a tough job and I've seen it from the classroom and from the administrative side. It is getting harder with new observation requirements and operational requirements. Plus expectations from students, parents, and society. On top of that teachers face problematic student behavior Here is some advice for teachers or want-to-be teachers.