NTSB Factual Report

On the third landing of his first supervised solo, the airplane drifted to the left as the student pilot was in the flare. The student corrected to the right with right rudder, but after the airplane touched down it veered to the right and off the runway. The student attempted to correct back to the left, but after the airplane did not respond he applied full brakes. After striking a runway sign the airplane came to rest on its nose and left wing tip off the right side of the runway.

NTSB Probable Cause

The student pilot's failure to maintain directional control of the airplane during the landing roll. A factor was the runway sign.