According to the operator, during a training flight in the pattern, the solo student pilot landed on the runway. During the landing roll, the student made a right turn to exit the runway. However, the airplane's ground speed was too fast and "he missed the taxiway." The airplane exited the right side of the runway just beyond the taxiway turnout and the airplane went down a 10ft embankment and stopped.
The airplane sustained substantial damage to the left side engine mount.
The operator reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation.