Hmm. I am not familiar with the Neale III, which appears to be more properly called the NARA-III, but in looking it up, find that the age range goes up to 12-11, which in USA/CA would be year 6. So hitting the ceiling would presumably have included a fair number of gaps on the way up. (And it would suggest that Aussie children read OTA about a year ahead of USA kiddos, if yours is at all representative!)

...pronounced like the long vowel and first letter of the alphabet...