In the UK the 2 tier education system we used to have relied on an examination known as the "11 plus". If you passed with a high enough score you went to a Grammar school for the "clever" kids. If you didn't you went to a Secondary Modern school. The opportunities available were proportionate to your score in what was essentially a cobbled together IQ test of the sort under discussion that you took at age 10-11. It could completely alter the course of your life.
Not all societies and their education systems are on the same plane when it comes to such tests. Certainly not ours compared to yours.
Though neither do I see our systems trending in such a way at the level of grammar schools either. At least not at the present. But then education itself remains somewhat of a political football here as well. Which shouldn't be the case IMO, but it is. Spread out over 50 states and territories where politicians and taxpayers have very different notions of how or not to fund education. Education here is neither socialized or centralized.
Sound familiar? That pesky Tenth Amendment again.