There's absolutely nothing wrong with finishing early.

Pro tip that not everyone knows: While there are some prerequisite requirements for specific assignments on the calendar (e.g., you obviously have to finish the first draft of your premise and outline before you can "revise" them), there's nothing in the rules specifically forbidding authors from completing the assignments out of order.

We want the Prep to be a tool for any writer who finds it useful, whether you're motivated by competition or just appreciate the roadmap.