So you made a mistake on your Common App? And the college you applied to has instructed you to contact the admissions office directly to make the correction? (Stanford does this, for example.)
As always, you must be professional. Whatever you write very well may become part of your application.
First, here’s an example of how NOT to write (and yes, I may exaggerate for effect):
First email at 12:14 PM:
*oh hai i made a mistake on my application, so can you fix it for me? my sat is actually 1920, not 1290. okay thanx.
Second email at 2:17 PM:
*oh hai, i forgot, my name is my full name. kthxbye!!!111
I hope that that communication is obviously wrong. If it’s not, please, let’s have a talk! Or talk to someone who has experience with writing for help (such as an English teacher or someone who has a professional job).
This is a better version of the email:
Dear Admissions Officer,
Unfortunately, I recorded some information incorrectly on my Common App. I tried to update it myself, but it’s locked, and I can’t make the change myself. I checked your site’s FAQ, and it said I should email you with corrections. My SAT score is 1920. The score of 1290 is incorrect.
Thanks in advance for your assistance .
My Full Name
Obviously, if you’re going to use this email, please use this as a template only. In other words, don’t just copy and paste this email–edit it to make it your own.