Extra curricular activities make the students more active in schools, no doubt about it. Because just studying the lessons and scoring good marks in the exam and topping in the rank list will not be sufficient to develop one's personality. Only studies will not give the students the much needed personality development. Studies are also important no doubt, students will get bored if they are confined to the studies only. Other activities like painting, music, sports, arts etc or any other activities of their interest will make them more active and will help in their full personality development.
Otherwise the proverb 'all work and no play, will make jack a dull boy' comes true in their case.