I think SAT’s are the best proxy we currently have in freely available data. I think they are at best useful for determining sortition for university work – in other words, they successfully fulfill their purpose. They are problematic proxies for IQ since some of us (myself included) do not really reach our biological IQ until our early twenties, and others are completed by late high school. I have very high confidence in Ravens. However, while iq traits tend to scale, in heritable IQ there is an asymmetry between Spatial and Verbal, with heritability of verbal more dependent on the mother. This is rather obvious in retrospect, and explains why some groups with high verbal performance also express higher rates of homosexuality and behavioral effeminacy.