The division of students into different classes according to their grades might cause some problems, such as hurting the pride of some students whose grades are not so good.

根据成绩将学生分成不同的班级可能会导致一些问题出现，如伤害一些成绩不太好的学生的自尊。

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Quality and amount of sleep have a big effect on the grades of teenagers and college students, according to two studies reported in Time magazine earlier this year.

《时代》杂志今年早些时候公布的两项研究显示，睡觉质量和时间对青少年和大学生的学习成绩有着重要影响。

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According to the Universities and Colleges Admissions Service, 55% of applicants do not get the grades predicted by their teachers.

根据大学及院校招生事务处，候选人当中有55%的人无法得到他们老师的预测级别。

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For one, enrollment is on the rise for grades K-12: According to the National Center for Education Statistics, enrollment in public elementary and secondary schools rose an estimated 26 percent between 1985 and 2007.

CNN: 10 growing jobs in education

In general, girls are less likely than boys to start school but boys are at greater risk of repeating grades and dropping out, according to the Digest.

UNESCO: MEDIA SERVICES

When researchers tried to lift the grades of struggling college students by raising their self-esteem, the students' grades got worse, according to a 2007 study of 86 students published in the Journal of Social and Clinical Psychology.

WSJ: The Right Level of Self-Esteem for a Child