<ol>
<li><p>Call the admissions office and tell them you’d like to update them on your most recent achievements/activities, whatever. Ask if there is someone you should contact.</p></li>
<li><p>If they give you the go-ahead, write a letter to the specified person or department. </p></li>
<li><p>Be professional, to the point and write it well. Briefly discuss your current activities/accomplishments, then state you will definitely enroll if accepted. Add a little “I sincerely hope to join the class of ___ 2012” if you want.</p></li>
</ol>
<p>Good luck!</p>