It depends on how one defines intelligence and what specific things are considered material to the measurement. IQ tests measure the things that IQ tests measur

It depends on how one defines intelligence and what specific things are considered material to the measurement. IQ tests measure the things that IQ tests measure. The challenge is that the things we often want to determine in trying to assess "intelligence" are multi-dimensional, multi-variate and have complex interactions. Personally, I consider most typical assessments of a person's general "smartness" to approach zero utility.