School officials presented the findings at the school board meeting Thursday night at East Chapel Hill High School.
This was the first year the system compiled a separate report on proficiency not only after the traditional May testing, but also after two possible retests.
The district also collected information on the VoCATS, vocational assessment tests, and a separate report on kindergarten through second grade.
Diane Villwock, director of testing and program evaluation for Chapel Hill-Carrboro schools, said that 4,714 students were tested districtwide and that 92.2 percent of all students passed the tests the first time.
She said those who earned proficiency had to pass both the reading and mathematics end-of-course tests.
Villwock said that if students fail the first exam, they must take a retest the following week, with no teacher supplementation between the two tests.
"There's no intervention," she said. "They're literally back-to-back."
If students do not pass the first two chances at the end-of-grade tests, they must attend summer school, she said.
She said about 97 percent of students eventually earned proficiency for the last academic year.