It contains somewhat open-ended knowledge questions you'd likely have been exposed to in your culture, reaction time tests for finding particular symbols among many others, solving mechanical puzzles, definitions of words you will have encountered, mental arithmetic and others.

This isn't quite the same as measuring one's ability to communicate well, understand others' intentions or influence others. But it does test a much wider spectrum of cognitive skills than what many people believe about IQ.

It's also worth noting that success in the real world also depends on other traits than all the ones we've discussed. Some notable examples which probably aren't talked about so much, is the tendency to stubbornly work through a difficult problem (out of pleasure or innate drive), the capacity to routinely get a lot done or coming up with and thoroughly exploring new (particularly unconventional) ideas.

Beyond a certain point, I'm a bit skeptical that social skills in the absence of other intellectual strengths would generally lead to spectacular success. You won't lead a team to success if you don't know where you're going. Although I suppose you could to a certain degree deduce the right direction from the less eloquently communicated knowledge of others. But that does require the ability to distinguish good ideas from bad.

However, in order to make good decisions and complete good work at an individual level, analytical intelligence is extremely important. Without analytically intelligent people, modern technological society would be impossible.

Of course when someone combines high social and analytical intelligence, their success can be magnified, and they are positioned to lead complex organizations.