Have you seen this? https://hyperpad.zendesk.com/hc/en-us/articles/202467445-Sharing-Values-Between-Behaviors

You can output the score to an IF. then the IF behaviour will check if it reaches your desired score.

That being said,

The Add To Score behaviour has all of this built in. It will trigger an event when your score reaches a specified number.

So, on the add to score properties there is a field that says "Event when score reaches".
Make that 11.
Then connect a Save behaviour to that.
And it will save when the score reaches 11.