IQ measurements can have some significant bearings on ability to a point, but beyond certain thresholds, the measurements mean little.
You need an IQ of 75 master the elementary curriculum; 105 to complete an academic or college prep program in high school, and an IQ of about 115 to complete college with grades to enter a graduate program. Beyond this IQs seem to have very little correlation for success.
This does not mean that an IQ of 180 is not significantly better than an IQ of 140; only that it will have little personal impact on success. A scientist with an IQ of 130 is as likely to get a Nobel Prize and a colleague with an IQ of 180.
From “Outliers” by Malcolm Gladwell.