Go back to beginning
I started the Scottish Gaelic and found I was having problems. I wanted to go back to the very beginning and start again.
Can I do that?
That's certainly an option but I'd like to point out another option that doesn't lose your progress.
Once you reach level five in a given skill, you can choose to practice just that skill - twenty exercises focusing only on things covered in that skill. I have golden crowned the first few but still go back to them every day, at least twice a day, to go through them and make sure I don't lose them.
That said, I do certainly understand why you'd want to start over - I had considered it a couple of times before I committed to finishing a given skill and found out I could then practice just that one.
Edit: 20-ish exercises, however many are in a lesson ☺️