Ah, that complicates matters! I was working on the assumption that the year 5 report reflected to some extent the effects of IBS June onwards, and in this situation a panel's response is: So what were things like before?
However, I stand by my advice that, especially in your case, you should show the panel as much academic information as possible - certainly the year 5 report.
Although I firmly believe that exercise books are much more useful, you could, if you wish, bring the project work as well, and let the panel choose what to examine. (They'll only have a few minutes for this at the end.)
With regard to the O. of S., headteachers are specifically warned not to extrapolate directly from other reasoning test scores!
[See the Headteachers' Manual, page 19]:
www.buckscc.gov.uk/schools/documents/ad ... r_2008.pdf
You could raise this issue at the hearing under "Questions to the LA" - not that the officer is likely to know how your particular head arrived at his predictions. I would tell the panel what you believe happened, but throw in some disarming remarks such as "It must be a very difficult task" - It is indeed!
And yet some schools manage to come up with very accurate lists .........