Math is universal 1 + 1 = 2 in any culture no matter how the numbers look, but indeed math ability is influenced by schooling. However good IQ tests can use numbers in a smarter way, it's not actually a math test, like: what number is out of the place: 1, 2, 4, 7 (that's 2 because it's the only one that has round edges -- so you don't need much math knowledge to get this, you just need to be familiar with the concept of numbers and have flexibility in thinking to switch from one context to another -- which is what IQ test should measure anyway). And all the people have languages with words that fit in a way with other words, and yes, while we might fit birds and mammals in different categories, some other cultures might categorize animals in big and small, but that is taken into account. I don't know what's your impression about Africans, but many live in cities (40% last time I checked, not much lower than some European or Asian countries) and go to school, the bushmen who might have problems understanding the simple math concepts required by a test are actually very few.
But granted, some of the concepts are school influenced, that's why I asked about tests that are neutral. Any way, I'm not that interested in the subject, I don't know how I got into a "debate" about it, I just posed a question and the response I got was giving me a clear example of a knowledge test, not intelligence, which was not what I asked for.