I had the same issue, though due to a premature birth fine motor control problem, and I simply typed my exams, or at least the ones with essay questions. For the high school ones that generally meant being sent to some teacher's office with a typewriter for the allotted time. In college it was most often a case of 'here's the exam, take three hours and drop it off in the box'.

The honour system actually worked. When I taught English in Poland after college, I was shocked by the amount of cheating, and even more at the way in which the students saw it as a normal thing (I was ordered to pretend I didn't speak Polish, so the students spoke freely in front of me, safe in the knowledge that I couldn't understand them. Heh. They were a little surprised at my uncanny ability to detect cheating. I also had the best knowledge of the school gossip, bar none - I knew exactly who was taking which drugs, having what spat, and sleeping with whom - it was sort of fun.)