Help with a appeal letter?

I working on a letter of appeal because my application was withdrawn from csulb due to the fact that I missed one of their deadlines for AP scores. I feel if I right I strong appeal letter I might have chance to attend in the fall. If anyone is willing to read my rough draft and give me some tips or any sort of advance that would be very much appreciated!! Can use all the help I can get, thank you in advance!

Sure

Why did you miss the deadline?