There is a test called the Nelson Denny that my son's dyslexia doctor used as part of the testing he needed to get College Board accommodations. The Nelson Denny is a reading test for high school and college students.
As a homeschooler, my son (who has dyslexia) didn't have an IEP, but I did monitor his progress with various tests and had him professionally assessed on a handful of occasions. I stopped with the regular testing when he was working on a high school level across the board, but I continued to keep an eye on his progress in an informal way. He is now 17 years old and doing college coursework, and I'm still seeing improvement. In fact, there seems to have been a surge of improvement since he turned 16.
