<p>I want to show my deep interest in a school, how to write a letter like that? Can anyone give me a example</p>
<p>Thank you in advance!</p>
<p>Letter? A "Why?" essay may work better IMHO. Especially if it comes unsolicited. I guess, harried as the adcoms are, they don't mind a heartfelt expression of attachment to their school;)</p>