Self-review can be useful at U12, but I would move away from a score.
A number can make a child feel that the whole match has to be reduced to “how good was I?” It also encourages comparison: was I an eight last week and only a six today?
I’d use two or three simple questions instead. What went well? What was difficult? What would you like another chance to try?
That keeps the reflection connected to learning rather than judgement.
You can still help them recognise standards. The difference is that a poor moment does not drag an imaginary score down.
I’d also vary the timing. Some children need the journey home before they are ready to think clearly about the game.
At U12, the aim of reflection is better awareness.
If the number becomes the thing they care about, the tool has started getting in the way of that.
