What is "sixth grades"

Usage examples of "sixth grades".

She remembered that one of her grammar school friends, a boy named Charley Biggers whom everyone had called Biggy, had had his appendix out during the summer between fifth and sixth grades.

With it he had financed cocktail parties for United States Senators, and prize contests for the nation's sixth grades, and he had done what he set out to do.

During the previous fall, Miss Sophie Turner, who taught fifth and sixth grades, had bestowed a great honor on us when she had chosen our fields to pick in.

This might well go down on my permanent record, something my elementary school principal had threatened me with every time I fled school with Jimmy Tait in the fifth and sixth grades.

Miss Hisler had been the teacher at my previous school, the one-roomer at Methodist Corners, where I went to the fifth and sixth grades.