"graduation class" is correct and usable in written English.
You can use it to refer a specific class of students who are graduating. For example, "This year's graduation class was especially distinguished, with many students earning top honors."
The graduation class was named in honor of Triton, and each graduate received a certificate of course completion and a commemorative coin celebrating the 50th anniversary of Tritons submerged circumnavigation.
He could scarcely read or write when he graduated from Central high school in 1960, and ranked 376th in the graduation class of 391.
Darrat brings out a picture of his military academy graduation class.
One of the men, Yasein A. Taher, was voted friendliest in his 1996 high school graduation class.
Of his 2011 graduation class of 60 officers, one is already dead and another has been blinded in shootings.
There weren't a lot of blacks in my high school graduation class - two, to be exact - which meant that race was somewhat of an abstraction, happening elsewhere, mostly on a screen or from the grooves of a record.
Two graduation classes later, there are 48 celebrants in the United States and Canada, with 30 more candidates set to begin training this fall.
Edmonton and places all over Alberta have been accepting dress donations for the Fort McMurray graduation classes of 2016, so that those who have lost dresses in the fire can still feel special on their graduation day.
Some hire staff from Starkey's graduation classes, paying well enough that the student can repay a tuition loan.
As colleges and universities increasingly recognize the need to offer students the opportunity to acquire international experience prior to graduation, classes structured around an international assignment are on the rise.
Taking a class or two over the summer will help to get all of the needed graduation classes and allow for an earlier graduation.
