Discredited may be an overstatement on my part, but it is a flawed measure of someone’s complete abilities and strengths.

Reference: https://en.wikipedia.org/wiki/Intelligence_quotient#Validity_as_a_measure_of_intelligence

While IQ tests are generally considered to measure some forms of intelligence, they may fail to serve as an accurate measure of broader definitions of human intelligence inclusive of, for example, creativity and social intelligence. For this reason, psychologist Wayne Weiten argues that their construct validity must be carefully qualified, and not be overstated. According to Weiten, “IQ tests are valid measures of the kind of intelligence necessary to do well in academic work. But if the purpose is to assess intelligence in a broader sense, the validity of IQ tests is questionable.” [emphasis mine]

There are other criticisms in that section of the Wikipedia article too.

You can study for an IQ test and raise your grade so it doesn’t really measure anything important, just test taking ability, which I suspect is where a lot of other positive correlations between IQ and college admissions/outcomes/etc factor in