Should students be able to ban a teacher if he or she teach well?

No, students should not be able to ban a teacher simply because they believe the teacher is teaching well. A teacher's effectiveness is judged by a variety of factors, including subject matter expertise, lesson planning, classroom management, and student engagement. While student feedback is valuable, it shouldn't be the sole determinant in whether a teacher retains their position. A system where students can ban a teacher based on their subjective opinion would be unfair, potentially silencing effective teachers and undermining the educational process. There are appropriate channels for addressing concerns about teaching quality, such as parent-teacher conferences, formal evaluations, and principal feedback.