Intelligence is largely related to STEM and memory in most instances. But there are a vast number of other ways to be intelligent. Perhaps you excel at emotionally connecting with people, maybe you're really good at cooking or tooling approaches. All of these are ignored in school.
School is nothing more then a checkbox along your path, you need to be able to read, write, do math, etc. But we ignore a large amount of our populace who may excel at grunt work, or maybe they are really good at leadership.
Just because you don't know y=mx+b or struggle at reasoning/logistical challenges does not mean you are not valuable to society. Maybe your 300lbs of rock solid muscle and in a past live would have been a top tier hunter. We do appreciate some amount of sports, but even that stops unless you're in the top 1-2% of the country.