<p>Somewhere in between formal and conversation, to the point. Include copies of anything at all positive since you applied. No need to repeat anyting re submitted GPA or scores. </p>
<p>Dear Sirs,</p>
<p>While of course I was disappointed to be deferred, I did want you to know that I am still most interested in attending blank u. </p>
<p>Since I submitted my application, I have completed AP blank and volunteered for blank.</p>