"Eighth graders" refers to students who are in the eighth grade of their education. It typically includes children around 13 to 14 years old, depending on the education system. Full definition
In other words, increasing the share of eighth graders in tracked courses by ten percentage points is associated with an additional 20,000 students scoring 3 or higher on AP exams nationwide. (educationnext.org)
Previously, I worked with third through eighth graders in a public school, and have taught continuing legal education to attorneys. (edutopia.org)
The new analysis surveys data from about 200 million standardized math and reading tests given to third through eighth graders in every state between 2009 and 2012. (nytimes.com)