Please HELP...Any tips for Appeal Letters?

<p>I got denied from University of Illinois at Urbana-Champaign.
Fortunately, they offer an appealing system but im not sure if people get accepted by appealing. Does anyone know of any accepted case?
This is literally like the only school that I have left... I really hope to go here.
My ACT is 29, and GPA is 3.9</p>

<p>I applied as undecided but somehow my application was reviewed by business department.</p>

<p>Can you please help me to write an appeal letter (max. 300words)?
Any advice/tips for me please?</p>