During a flight to prepare for his initial flight instructor check ride, the commercial pilot performed a 180 degree power-off approach and landing. During the landing, he flared the airplane about 10 feet above the runway. The airplane dropped and landed hard. After taking off again, he attempted to raise the landing gear but it would not retract completely, so he put the landing gear back down, performed the maneuver one more time, and then taxied to the ramp. After parking, he and the flight instructor who was sitting in the left seat noticed that they could not open the door to exit the airplane as the door handle was broken. After having someone open the door from the outside so they could exit the airplane, they noticed that the airplane's right wing had been damaged during the hard landing. Post accident examination by a Federal Aviation Administration inspector revealed that the wing was substantially damaged. During a post accident interview with the flight instructor, he stated that during the flight the commercial pilot was the "full manipulator of the controls" and that "I did not do anything".