ECE Exam scoring?

Does anyone know where to find a list of what scores on ECE exams equate to what grades at Excelsior College? I have a couple nice credit by examination handbooks from Excelsior, but they only show the score breakdowns for DANTES and CLEP tests. I've looked all around their site, but can't find it.

 

Here is one from COSC.
It shows a passing score, but not what's needed for an "A" or "B."

http://www.cosc.edu/enrolled/testing.htm

Of course, I am assuming it is the same for Excelsior.