A woman and her daughter were injured after the car they were in plunged down an embankment behind Junipero Serra High School in Tierrasanta Thursday.
The crash happened just after 4 p.m. in the school's parking lot off Santo Road.
Police told 10News they believe the mother and daughter may have been going over driver training skills when the crash occurred.
The girl was not seriously hurt, but her mother was airlifted from the scene and taken to the hospital with injuries of unknown severity.
No other injuries were reported.