The power of training lies in repetition. Nothing stops you from redoing a scenario as many times as you like, and it's actually recommended.
Relaunching a scenario
From your scenario library, simply reopen the scenario and start it again. Each run creates a new simulation, with its own debrief.
Comparing your runs
All your simulations are kept in your session history. By reopening your successive debriefs, you can see concretely what improves from one attempt to the next: it's very motivating, and far more telling than a single isolated score.
Our advice
After a simulation, pick one area for improvement from your debrief, then redo the scenario focusing only on that. One objective at a time: it's the most effective way to progress.
See Improving from one session to the next.