When I took the SAT they required you to copy a sentence in cursive on the scantron. I don't know cursive so I just scribbled on it. Didn't seem to hurt my grade.
That is to catch people accused of hiring someone to impersonate them and take the test for them. Where that is suspected, they can make the real person copy the sentence out again in cursive for comparison, on the theory that it's much harder to accurately copy someone else's cursive than their printing.
I think that was the sentence where you promise not to cheat.