I'm in Class One, Grade One.

我在一班一年级。

youdao

One thing I can guarantee from past experience in this class, is that the median grade will be a B+.

不过从教学经验看,中间成绩应该是B+

耶鲁公开课 - 博弈论课程节选

One example is the Harlem Village Academy, which opened in September 2003 with one class of fifth graders and has been growing one grade per year since.

FORBES: Fact and Comment

As part of my job, I reported alarming inadequacies: in one case high-grade equipment (ASME III, class 1) was operated in nuclear power reactors with no accepted safety file, regardless of a previous accident and a half-dozen failures in achieving acceptable design results.

BBC: Can nuclear power ever be safe?

When I went to grade school in a working class neighborhood in the 1950s, there was one kid in our class of 40 whose parents were divorced.

FORBES: The Real Marriage Crisis Is Economics, Not Gay Marriage