Grade在英语中需要大写。来源是它是一个名词，表示年级、等级等意思。
例句：
I'm in the third grade. (我在三年级)
He got an A grade for his math test. (他的数学考试得了A)
同时grade也有动词的形式，意思是评分, 评定。
例句：
The teacher graded the papers yesterday. (老师昨天批阅了试卷)
The project was graded on a scale of 1 to 10. (项目按1到10的比例评定)