My son also answer all the questions correct and he's born in June 08 but has not received a call even we are put on the waiting list and I wrote to them. Not sure how they rank people from the waiting list.
I call them again today and ask how they decide who to call first on the waiting list and they say it's base on how the kid perform in interview but I say my son also answer all questions correctly and then how to decide who 1st and who 2nd among all those who got the questions right. They did not answer the question but basically say there are too many candidates this year, so cannot fulfill all the need