I wrote the wrong name of the school in my secondary. I emailed admissions and told them of my mistake. Luckily, they allowed me to resubmit my secondary with the correction. I was offered an interview and subsequently accepted.
When I first messed up (after hitting submit) and reading it afterward, I flipped out. I was debating back and forth whether to email them or not, or just hope it slips by, etc etc. I finally said F it and emailed them, and I'm glad I did.
Hopefully OP has just as much success