Recently, "children's smartphone addiction" has become a problem. Some parents may worry that "my child is addicted to smartphone games and has a problem with his grades." However, I wonder if children with good grades do not own smartphones and do not play games or use SNS. Even if they are given smartphones, are they still learning with educational apps? If not, how do you interact with your smartphone and improve your grades? Exploring how to use smartphones for "can-do children" and how to teach parents.

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