N.C. Gen. Stat. § 115C-74: School system defined.

The school system of each local school administrative unit shall consist of 12 years of study or grades, and shall be graded on the basis of a school year of not less than nine months. Schools within the system may be organized in the discretion of the local board of education. (1955, c. 1372, art. 1, s. 5; 1959, c. 573, s. 1; 1981, c. 423, s. 1; 2001-97, s. 1.)