You absolutely must be joking.
This tells me that you have never learned a foreign language to a high level of proficiency, and that you know very little about art.
Regarding the rest of your post, talent certainly exists, and things like motivation and talent are better predictors of success than IQ, but IQ tests don’t claim to predict success (even though IQ scores and success might be mildly correlated).
As I mentioned in another reply (please read it), folks seem to think that IQ tests claim to predict success. They don’t. It’s an unfair onus to put on IQ tests.