Help! Wrong grade level - how bad is this mistake?

Help! I accidentally clicked that I was in 11th grade instead of 12th on my Coalition app, and didn’t realize until after I submitted it to five colleges! I’m so upset! WilI colleges really think I’m a junior (the rest of my application such as coursework and activities clearly states I’m a senior)? Also how terrible is this mistake, and should I contact the admission officers to correct it? Thank you so much!!!

Contact the admissions officers ASAP! They might not throw out your application, but they’ll probably look at it with suspicion.