The students in a particular school generally showed poor grades. It was suggested that most of the students had no time for leisure activities to freshen their minds. The students took extra tutorials after the school hours, which possibly dulled their minds. The principal decided to do away with the tutorials to enable the students to schedule their time according to their own needs. Even after quitting tutorial, the students showed no considerable improvement in grades.
Which of the following statements would best explain the reason for the unexpected outcome?
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