<p>Guys, I am literally tearing my hair out for this. I happily submitted all my common app materials to my colleges, and then I realized that I left out a second semester band course for zero period. (H. Wind Ensemble) I'm really scared that if I email each college, they will think I'm incompetent for not checking. Adding the course will only boost my GPA, but I'm worried that they will see my empty slot in zero period. What should I do? :(</p>