5th grade I think
Class Act - 2014 was released on: USA: 2014
yayyy we rock class of 2014
This "average" is the mode for the class.
Yes, in this case "seventh-grade class" should have a hyphen to show that the words "seventh" and "grade" are functioning as a single adjective modifying the noun "class."
Business Class - 2014 was released on: USA: 23 February 2014
Top 6th grade class is 601 honors
It is the same in America, only it is called 6th grade, not class.
The nouns in the sentence are teacher and class. The words "fourth grade class" can be considered a compound noun, or the compound word "fourth grade" can be considered a noun adjunct, where grade is also a noun.
"so fresh, so clean class of 2014"
Lauren Cimorelli is currently in the 11th grade.
If there was only one assignment, your grade in the class is the grade received on that assignment.