成绩等级的英语怎么说?

Academic grades or achievement levels are usually referred to as "letter grades" or "grade points" in English.

The most common system in the United States is the A-F scale, where A represents excellent performance, B represents good performance, C represents average performance, D represents passing performance, and F represents failing performance.

In the United Kingdom and many other countries, the grades are often expressed as percentages or numerical grades on a scale of 1 to 100 or 0 to 20, with higher numbers indicating better performance.

Here are some examples with translations:

"I got an A in my math class." (我数学课得了A)
"She received a grade of 85% on her history exam." (她历史考试得了85%)
"He was awarded a grade of 15 out of 20 for his English paper." (他的英语论文得了15分，总分20分)