My child is also fifth grade student who is not interested in English. But he got good scores at English exams. There is no short-cut in learning English, the young pupil lacks of initiative, you have to push him or her to study every day by preparation of the texts before the class and reviewing the words or phrases after class.You have to take up at least half a hour to refresh English every day because pupils forget the words easily.In addition to this, find some interesting books such as fairy tales in English to read to them to raise their interest in English. They not only learn something interesting but also get an idea of what the real English is.