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请你根据提供的信息，描述Mark的变化。
例文：Mark is a fifteen-year-old boy. He used to be a “problem child”. He used to play games a lot. He didn’t use to finish his homework on time. In fact, he really didn’t study hard, so he used to get bad grades. What’s more, sometimes he even fought with his classmates. H caused so many troubles that he had no friends at school. But luckily, with the help of his teacher and parents, Mark has really changed. Now he studies very hard. He listens to teachers and takes notes carefully in class. He spends a lot oftime on his homework. He is friendly to the classmates and often helps others. Mark is a top student in his class now.
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