@Kuromusha, I am a newbie here and for some reason, this thread caught my eye. Let me put it this way, I see nothing that you mention to be reality. If you think that asians have a high IQ, then why do their parents need to spend hordes of money on coaching. Trust me, coaching continues throughout the education years for asian kids. I am amazed at why kids with higher IQ even need to be coached. I know of so many cases where kids simply struggled to find their feet once coaching was taken off. I have to concede that asian kids have tremendous work ethics and they work very hard. Absolutely no doubt that that. But then to attribute higher IQ to kids who would otherwise struggle the moment coaching is taken off, is not something that I would agree to.
I see that you have posted pictures of Grace Du on this thread. What you failed to see is that the kid that followed Grace on winning the NSW Premier Spelling Bee is my daughter, Sri Vaishnavi Kolluri, and we have an Indian background. The kid who won the Seniors was an Aussie girl from a Rural school. And just for records, there are a number of kids before Grace from European / Caucasian backgrounds who have won the same contest. Unfortunately, I find your arguments quite shallow.
Coming back to selective test, yes, the Eastern Asians do dominate the scene, but that is thanks largely to their work ethics, hard work and above all coaching. I know of Caucasian kids from my daughters school, who were coached and got into selective. I know of Caucasian kids who made it to selective without coaching. I know of asian kids who made it to selective with and without coaching. I also know of my own daughter, who made it to selective without coaching. So, your argument of higher IQ being associated to eastern asian kids is quite shallow.