do we point this out it will it look like teaching them to suck eggs?
Good question, IT.
First of all, work out how accurate your headteacher has been compared with the average. Sally-Anne gave the last available figures in one of the stickies:
For children ranked as a "1" on the OoS (i.e. predicted to score 131-141), 78% actually achieved the qualifying mark of 121+.
For children ranked as a "2" (predicted to score 121- 130) the actual success rate was 43%.
If your head has done well (and your child is in a good position), then after the LA statement, when the chairman turns to you and says "Have you any questions?", reply "Not really. We do understand the Authority's case. Could we just ask one question about the Order of Suitability - it must be a very difficult task, but would this one be considered reasonably accurate?"
The LA representative may not know the figures, so if necessary you can go on to say "I understand that last year 78% of the "1"s were accurate and 43% of the "2"s. This head has got ......"
That's all, I suggest. You've drawn their attention to the accuracy. No need to point out where your child is - they will see that.