Actual IQ tests are not used in higher education in the US because the test results are considered horribly flawed and biased. Thus folks tend to only do IQ tests for bragging rights (eg joining organzations like MENSA) in the US. So I would put absolutely no stock in an IQ score, and nor do med schools, law schools, dental schools etc. But if your question is really do smarter people do better in med school, as a doctor, etc., then the answer is obviously yes.