Thats patently untrue. Darwins cousin Sir Francis Galton the father of eugenics and "intellectual measurement" was the person that devised the first tests.
Jesus Christ, you are not entitled to your own [false] facts. Binet created the first tests to evaluate intelligence, not Galton.
Galton did not come up with the first intelligence tests. Galton was the first to come up with a theory of intelligence. He theorized that intelligence was heritable, and linked to the size of the brain, and could be inferred by observing and individual's behaviors. He further theorized that different races would have demonstrably different brain sizes. The underlying theme of Galton's theory, which you seem to have no knowledge about, was that Galton believed that differences between racial intelligence would explain why different cultures developed at different rates.
Galton's own research revealed that his ideas were bogus, and he himself abandoned the whole thing. While he did manage to intuit a grain of truth, his approach of trying to determine intelligence based on observed behaviors was severely lacking at best. And cranium size turned out to have no meaningful racial correlations. Galton never developed a test for intelligence. When his research didn't pan out like he thought it would, he moved on and never visited the subject again.