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Steve, it looks like you may me going through 30 Days to Play. In that series I think you can move forward any time you like.
I wouldn’t worry about “mastering” any challenge in TAC. Just give it your best for at least 10 minutes and then mark it complete. It doesn’t matter if you actually go through the entire challenge or not. The skills involved are taught repeatedly and will come back around.
If you want to go back to an old lesson, feel free to do so! I have several favorites that I go through regularly. As long as it’s fun, keep doing it. You can set up your schedule the way @Moose408 has done, but just beware of it turning into work! He uses words like “practice” and “work on” which are very much in the realm of work. We actually frown on work around here, we play guitar! But it is ok to struggle a little bit, because when we struggle is where we are actually being pushed and learning the most.