Teachers who don't let you finish the class

we are paying for the time we were being taught in school. i should say teachers should finish the class on time and let her class learn more. if lessons are already done, they could give activities. But sometimes teachers let their students go out of the class early as insentive for them being obedient and good in class.

They are bad models and they lack morals. As a teacher, they should always try to improve the standard of any student in his studies and behavior too. Allowing not to finish the course, the teacher is doing more harm and in other words, misusing his powers. Revenge is not a suitable word in a teacher's dictionary.