No, something that has multiple parts -- "g" (i.e. not requiring demonstrating external domain knowledge already known before the test), tests of domain experti

No, something that has multiple parts -- "g" (i.e. not requiring demonstrating external domain knowledge already known before the test), tests of domain expertise in whatever common body of knowledge a university wants, and a section which demonstrates previous effort to study/prepare. All 3 of these are worth knowing independently -- for some degrees programs, IQ alone would likely be sufficient. For others, a moderate level of IQ and a high level of willingness to study. For short certificate type programs, showing extensive pre-existing knowledge could be a big factor.