Student performance. Some students don't care about getting a good grade in the class, these students don't learn (at least not as measured by the school), and

Student performance. Some students don't care about getting a good grade in the class, these students don't learn (at least not as measured by the school), and it's obviously the teacher's fault from the perspective of this particular principal. Admittedly, I don't know how the grade was determined. Even if it's just participation, there may be students who wanted an "easy A" and actually don't participate.