@cwebber When I was teaching, there was this one kid who struggled so hard with (probably) undiagnosed dyslexia and dysgraphia that new never learned to read 3 letter words like "the" or "dog". At 14.
But he was smart and articulate. So while I forced him to practice writing and slowly start the extremely hard process of learning to read, I tested him on all the other subjects verbally. Kid was brilliant!
His mom knocked on my door when the report cards came out with tears in her eyes. He had never passed ANYTHING before.
He deserved that grade. He eventually graduated. Even now, he describes reading as trying to catch words floating down the rapids.