N28BC

The student pilot reported that he was doing touch-and-go landings and that on his sixth landing approach (simulated short filed landing) the airplane was "a little high." The pilot stated he "decreased altitude" by decreasing throttle and "reduced pitch" while maintaining an approach speed of 65 knots. The pilot stated the airplane was over the runway and that just before he was ready to flare, the airplane "suddenly impacted" the runway in a nose-low attitude. The airplane sustained substantial damage to the firewall as a result of the hard landing.