I bet you haven't come into contact with much of this sort of thing before, and I further bet that if you practised doing this type of test for a while then you'd start to find them very easy.

As I said, IIRC such tests are only supposed to be accurate if you hadn't done them before.

I'd dispute the test's claim to be 'not culturally biased'. Obviously it doesn't require native-speaker English or literary knowledge, but equally obviously your score will depend heavily on how much you've been previously exposed to ideas about symmetries and abstract mathematics.

I mentioned that before, but how would you go about designing an IQ test even less culturally biased than that?