I have a story about this. I learned in 6th grade from some typing game with some kind of futuristic city as the background. There were lessons and tests that you had to do. For some reason, the teacher decided that if you could pass the tests at 30 WPM without doing the lessons, then you didn't have to do the lessons, but if you couldn't pass even one test, you had to go back and do all the lessons you skipped. Why he landed upon this retarded system I will never know, but those were the rules. I decided to try the tests and was flying through and playing games for the rest of the class (you only needed to do one test a class). I probably had 40-60 wpm on everything, even the numbers portion. Then I got to symbols, and my world fell apart. There were probably like 4 more classes left in the year and all of a sudden I had to pass a test that was like 50% symbols and numbers. I would honestly probably have a hard time with it now. Back then, it was totally impossible. I was getting like 7 wpm, and there was no way I could slog through all the lessons. I don't think the class was graded like normal, but I ended up being one of the few people that didn't pass it perfectly, even though I was one of the fastest typers. And the teacher wouldn't cut me any slack. He was just like "Well you should have done the lessons." Why!? Why was that a rule? How does not being able to type symbols quickly make me not a good typer? Never have I ever had to type 9!.> #* before or since that class. Why couldn't I just do that particular lesson? I'm still salty about that stupid class.
Also, I never understood why no mistakes were allowed in any typing class I took. I make mistakes all the time when typing, but I'm still faster than like 95% of the population. If you can type the required speed, why do they care. Maybe this has changed. I don't know if they even teach touch typing anymore.