My students have not come across prepositions before, so we were learning (and teaching each other) as we went. You can see the dynamic changes instantly with the boy joining us? The girl assumes the role of explainer & intermediary, supporter etc. This would not happen in an actual test - one at a time please! The examiner would have a script & time-plan to follow, too. We would be sat at angle like this, or next to each other. I think it is clear that young learners CAN DO if given time & a fair chance; they don't need translations or super-genki distractions!
We are going to be adding more Cambridge English speaking test practice videos on our Youtube channel this year; you can already find loads of examples of our learners making/singing/doing/giggling (a lot)...mostly fun & games at Luna but this I think the proof of the pudding: a serious CAN DO pay off.