Is it possible to reset a skill? I have one that is already marked as completed, when I haven't actually started it at all. I can obviously access the Practice, but I haven't learnt any of the associated words/phrases yet.
Nope - you cannot reset a skill on its own.
A lot of trees have tied skills - when you do a lesson in one of them, it get marked in 2 of them. German has (at least) two of them People 1/People 2 and Nominative/Possessive pronouns
Ah, that must be what happened then. I've noticed that before, I just didn't think that was the case here because there are words on there I haven't encountered before. I'll just have to check out the vocabulary, I guess! Thanks!