Dear Sleepless Mum
If one of your main arguments is the school's specialist status in Science, it is inviting questions about your son's interest in and aptitude for Science - unless you have already addressed this in your submission or in your presentation.
You don't want to give the impression that you are really applying because (1) it's a good school, (2) your son is strong at Maths, and finally (3) there's Science!
If I put on my old panel member's hat, I would like to hear that your son is particularly strong on the Maths/Science side, and probably that Science is his favourite subject. In addition to a sound KS2 prediction, I would like to see some really positive comments about Science in school reports, or a separate letter from the school about his aptitude for the subject. I would hope to hear about visits to science museums, his enthusiasm for science projects, the books that he reads on scientific subjects, etc.
Just some suggestions as to what might interest the panel!
Worth mentioning the Academy for able mathematicians - but slip it in after highlighting all the points to do with Science.