There is no simple way to rank apellants. If there was, you could automate the system, thus loosing the 'human' input.
Capers puts it in a nutshell
Inyourowntime - I'll try and give a few thoughts. (I appreciate that what I've seen is a summary, and that some of my points might be covered elsewhere.)
The optional Y5 SAT of 4a fits with the Y6 target of 5b, but not with the prediction of 4a/5c. It could certainly be helpful to have some recent improved scores.
I wouldn't highlight his "hard work" (however praiseworthy).
See: "Janet"http://www.elevenplusexams.co.uk/appeal ... aneous#e24
I think I would make a bit more of the maturity issue, and spell out at this point his exact date of birth!
I note that the school is being very supportive. Does that mean the confidence matter, and the reassurance about timing, are dealt with in their letter?
What is the purpose of the "Outside of his academic achievements" section?
I hope it isn't:
You could probably include the first three points at the end of your academic section as examples of academic interests outside of the curriculum.
Points 4-5 seem irrelevant to an appeal.
Point 6 could probably be incorporated into your section about reasons for wanting a place?
You make the argument about three sciences, but would you say science is one of his strengths? (The 4a in Y5 suggests it could be, but there's no prediction for Y6, as it's not a requirement.) If you are in a position to highlight some good evidence of ability in science, the issue of separate sciences becomes so much more important.
Is there any particular reason why the choice of a second language matters?
Just my view - but I hope it's of some help.