I looked quite a bit as well but did not find anything. I did talk with someone from PPI and was told that the computer exam is usually taken by less than 10% of the Electrical group. I'm going to be taking the Computer test for the second time this fall and hope it is my last. I made the mistake of taking the Power test 3 times since there were so many courses for it but failing all of those attempts.
There are a couple posts with some materials that others have used to take the exam and pass. Search for the PE computer preparation.