Do the panel look at data of what percentage passed from each school, or how well the school performs generally.
The appeal papers (received around a week before the hearing) include an appendix with information about the number of pupils qualifying at the school, and some percentages relating to the school's previous KS2 results. How much notice of this is taken, if any, rather depends on the individual panel. If you were to refer vaguely to 'problems at the school', it's likely someone on the panel will start to scrutinise the appendix!
DD has been assessed as a 2 & 2 - not sure if that is good enough - we would have liked at least one 1, but can't do much about that!
I don't think panels pay much attention to 'attitude' - the 11+ is. after all. about ability and achievement. A '1' or a '2' for the HTR (headteacher recommendation) is fine, depending on the head's standard. What I mean by that is - heads might be too strict or too lenient in their grading. The appendix includes a breakdown showing how many children at the school qualified with a '1', how many with a '2', how many with a '3'. A panel might then conclude that in a particular school a '1' looks to be over-generous, or that a '3' is too severe!
I can't pretend that the process isn't stressful, but we'll do all we can to support you.