What is the ruling on a Quran teacher holding her students accountable for numerous errors in writing Quranic verses and for not vocalizing words during exams?

The teacher, male or female, is a raiser and responsible for their flock, and they must guide students to what benefits them. Therefore, consideration of benefit is necessary when holding students accountable for mistakes so they avoid them, or overlooking them while warning them against them. The matter depends on what contains benefit for the students.