I think that that word "prodigious" can be off-putting because it seems to imply that your child should be a prodigy. That's definitely not what they're going for, though-- they're probably just using it as a synonym for "profound" as a shorthand for "working multiple years ahead" etc. Your child doesn't have to be a prodigy for entry.
If you have qualifying scores on both IQ and achievement tests, I wouldn't sweat the application that much. Just fill in some general statements about your child's intellectual abilities that are out of the ordinary in your opinion and in line with the testing.
