跳级

例句：

1. 1. She decided to skip a year and start high school at age 14.
   她决定跳过一年，在14岁的时候开始上高中。
2. 2. He was able to advance in grade by taking advanced courses.
   他通过选修高级课程成功提前升级。
3. 3. The student is advancing in grade because of his excellent performance.
   这位学生因为出色的表现而提前升级。