> he entries marked with an asterisk (*) were to take place at Bellevue Heights Primary School (Year 5) and the others at Blackwood High School (year 8: General Studies, Year 11: Physics, Year 12: Mathematics).
So he was able to attend classes out of his own year. What country is this? USA? Is that normal in the USA? I think here in the UK this isn't possible.
Presumably Australia where he’s from, but also possible in the U.S.
Australia
As others said, Australia.
Like Terence I also had "out of band" classes and free time to read advance material in both primary and high school.
During that period Australia also had good federal and state programs for clustering advanced kids on yearly subsidised specialist camps - optional and free if parents couldn't afford to chip in.
I bumped into him at the same time Paul Erdős was doing the rounds and hanging out with anyone that might show promise.