"Grade 6, Class 6" in Engpsh is commonly expressed as "Sixth grade, sixth class."
The term "grade" refers to the level of education a student is in, such as elementary school, middle school, or high school. The term "class" refers to the specific group of students within the grade.
Here are some example sentences using the phrase:
"I'm in Sixth grade, sixth class at my school."
(我在学校读六年级六班。)
"Which grade and class are you in?"
(你在几年级几班？)
The terms "grade" and "class" are commonly used in Engpsh-speaking countries for the education system.