The school license are issued to commercial school owner's that open a commercial school to teach driver's education.
https://www.ncdot.gov/dmv/license-id/driver-licenses/commercial/Pages/commercial-rules.aspx
2 Years
Admin Code "T19A:031.0500"
NC Department of Transportation
Division of Motor Vehicles
School Bus and Traffic Safety Section
3117 Mail Service Center
Raleigh, NC 27699-
919-861-3109