if you score your A4, and you fail, you will get a new A4. This is just in case you got into the habit of scoring, looking at your A4,
and then hitting the raise or lower button a few times until you pass. (You wouldn't do that, would you?
Well I did, so I thought I'd put the kibosh on that, just in case.)
You need to get 100% (i.e. within 0.5 cents) to go to the next lesson.