根据提示和上下文完成作文

Jack is a student. He lives with his uncle because his parents work in another city. He does really well in his subjects. (但是他过去是一名“问题学生”)。He was always late for school. What was worse, he didn't use to listen to the teachers carefully in class and (他从来不按时完成他的家庭作业). (用一句话表达老师和父母对他的担心). John, a top student in the class, decided to do something to help him. He talked with Jack every afternoon after school. He did his homework at Jack's home so that he could help him with his lessons. (用so as to改写画线句子) At the end of the school year, Jack did better in the exams. He made great progress. Now, with the help of John, Jack is more careful about his lessons. John is Jack's best friend now. I think Jack is lucky. He gets two things (总结Jack的收获).