IQ tests measure specific abilities but not all abilities.
As for the definition of success, that depends on the individual.
For example, to be successful in academia correlates reasonably well with IQ. However, success in sales far less so. Many successful artists also have high IQ due to their spatial and creativity traits, however that doesn't mean that they'll attain high levels of profit from their art. Programmers often have high IQ, but that doesn't guarantee executive suite jobs with their high salaries and lots of perks.
As for the definition of success, that depends on the individual.
For example, to be successful in academia correlates reasonably well with IQ. However, success in sales far less so. Many successful artists also have high IQ due to their spatial and creativity traits, however that doesn't mean that they'll attain high levels of profit from their art. Programmers often have high IQ, but that doesn't guarantee executive suite jobs with their high salaries and lots of perks.