Yes, usually everything starts with a pretest. If the player passes it he will be given the next pretest and so on. Until they don't quite know how to do it and then the lessons start.My son passed K and part of grade 1 in unit pretest and only then started the "lessons" (which look like the games he played when passing the unit pretests but it then starts going more slowly and has more repetition). So the "too hard" button only comes then? Good to know.
So maybe because your son was having a hard time with this one task he is in the actual curriculum now. You could check in the reports section like MK13 mentioned. It also breaks down what he has learned already.
