In high school, I took two semesters of typing on typewriters. For our tests, Mrs. Beck would take the correction ribbons out. There was no point in trying to fix anything, keep going as fast as possible.

We went to a tri-county competition that used computers instead. I was the only one from my school that realized we could correct our mistakes during the competition. I sacrificed a bit of speed to get 100% accuracy and won the whole shebang. Mistakes were heavily penalized in the scoring.