<p>I participated in an activity the summers after my 10th and 11th grade, so on Common App I put it under one of my 10 activities and checked the 10th and 11th grade boxes. However, I realize now that I should've checked the 11th and 12th grade boxes because that's what the instructions on Common App specify. I already submitted to a top university. Should I email them and explain my mistake? I don't want them to think I didn't do anything the summer before 12th grade since I didn't do any other activities beside the one I gave the incorrect dates for.</p>
<p>No, leave it. This is a very minor mistake and will almost certainly not hurt your chances. Bigger mistakes have been made; try searching for “clam fart” using the search tool on CC.</p>
<p>LOL OK I feel a lot better now. Thanks! XD</p>