The most I’ve seen is anecdotal. I homeschool and have four children, two with CAH, two without. They seem to be varied in their educational aptitudes with no correlation to the CAH. Jonathan (CAH) is my worst at math, but he’s still doing 8th grade math at 11 years old. Benjamin (non-CAH) is my worst at reading, but probably my best at math. Ginny (CAH) seems to be picking up both math and reading very well. She just turned 7 and she’s doing multiplication 2 over 2 (<-The link is to the actual page I wrote for her to do the math at). Samuel (non-CAH) does well since he generally gives around 70% of what he’s capable of. He’s 12 and doing 9th grade math and 8th grade in everything else.

So there’s really no evidence of the CAH making any more of an impact that simple personality differences make.