at importance during our whole life .in other words, it is the first step to success.
still, everything has two sides. its weak points are very obvious. you see, there’re top students in a class, where average students make up the majority. then teachers’ orders or suggestions are for the majority, not for top students. however, top students always have their own study plans and prefer special homework, so orders usually won’t take great effect on them. maybe you have thought out that teachers can give orders only to the majority and set some freedom to top students. however, it’s impossible .for a whole class, teachers couldn’t give order to part of the class, for the majority would question why they needn’t do such work, but we need? it would be probable that they think teachers treat them not equally, and will not obey teachers’ orders any more. this is a difficulty for teachers.
it also has another disadvantage&mda