Well, I am not sure about an essay but I can give you one or two points:

- Children usually don't pay attention in class. 
  They develop this thinking that they can learn the topic in the tuition and not in       school.
- When they have already studied about one particular topic, they start getting     hyper in the class and tend to make other children that do not go to tuitions or   that do not know the topic feel low.

hope I helped. :)

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