Our educational system is even more commie than the commies'. At least they eventually established prestigious highschools with entry exams, which separated the achievers from the underachievers and thus allowed everybody to progress furthest towards their maximal potential. By contrast, this liberal populist feel-good nonsense about leaving nobody behind inevitably ensures underachievement for the achievers. Moreover, IMO underachievers do WORSE under this system than under a hierarchic one. Finally, I bet teachers waste a disproportionate amount of resources on dragging "hard cases", while essentially ignoring kids that would do much better with a bit of help. It is hard to imagine a more damaging and less efficient system. And it all stems from fundamentally flawed liberal ideas.
As far as IQ tests go, IMO they are a useful measure of ability but are not perfect and do not really measure "natural intelligence". A simple proof of that statement is the known fact that people get higher scores after a bit of experience with the kind of questions asked. Also, people do significantly better after good schooling in critical reasoning, algebra, and geometry. This comes to show acquired ability on top of natural "horsepower". Further, some of the hardest questions ultimately have multiple acceptable solutions, depending on what symmetries are seen by different people. One symmetry is not necessarily superior to another, but the creator of the test chose one instead of the other, and so you may or may not get credited for it.
I am a good example of the above. As a kid (maybe 5th grade) I scored 135 the first time I even saw an IQ test. Now I score 150. Did I somehow get more "naturally intelligent"? Nah, just an addition of many many years of good schooling, mental exercise, and of accrued experience. What prevents me now from getting better scores is answering a few questions (usually 2 or 3) with alternative solutions that were not considered valid by the test creator. Sometimes mine seem more "advanced", sometimes not.
MENSA? Maybe a good way to pick up smart chicks. I might join someday just for that. Hehehe.
