ACTFL- silly question...

[uncapentin]

Okay, I know this will sound like a silly question but have to ask it anyway. I was looking at the ACTFL after reading a comment in a thread about the ability to choose from - reading, writing or oral proficiency exams. I noticed that English was one of the exams. Now, I know it would be assumed that this exam wouldn't work as a foreign language although for someone not raised speaking English it would be. How is it that a native Spanish speaker can take the exam for Spanish, pass and get credit for it as can someone who natively speaks Arabic, Russian, French, German and Chinese BUT those of us who natively speak English can't take the English exam for credit ? I would argue that there are many people who natively speak English, grew up in our schools and graduated, that aren't what you'd call proficient in the English language. Just like it is with other languages across the globe, the dialects in the English language vary across the US. 
   Also, since the ACTFL allows you to choose between reading, oral and written exams- yes, all carry college credit, is there a particular one that colleges are looking for in order to accept the credits for foreign language ?
  Yeah, I'm bucking the system I know.....