grade index

例句：

1. 1. The teacher used the grade index to evaluate the students' performance.
   老师使用成绩指数来评估学生的表现。
2. 2.The research team developed a new grade index system to improve student learning outcomes.
   研究团队开发了一种新的成绩指数系统，以改善学生的学习成果。
3. 3. The grade index is a crucial factor in determining the overall academic performance of a student.
   成绩指数是决定学生整体学业表现的关键因素。