N66540

The student pilot reported that after a normal approach on her solo flight, the airplane touched down firmly onto the runway and bounced twice. The pilot neutralized the flight controls when she was directed by the air traffic control tower to go-around. She applied full power, turned off the carburetor heat, and raised the flaps. As she raised the nose off of the ground, the airplane veered to the left, exited the runway surface, and struck a runway sign, substantially damaging the airplane’s firewall. The pilot reported no mechanical failures or malfunctions that would have precluded normal operations.