It is a very rare person who is going to use a larger percentage of the things they used in school in every day adult life, but that makes sense. Schools don't know what we're going to be when we grow up, so we have to be prepared for anything.
But what we learn should at least be challenging and enriching, so that's useful. So yes, the stat is probably true, but only in a very literal sense.
I forget if you mentioned any restrictions about the definition of "what we learn in school," but in case you didn't: I'd say about 90% of what we learn in school is how to be a functioning person anyway, so no, I don't think it's useless.
But what we learn should at least be challenging and enriching, so that's useful. So yes, the stat is probably true, but only in a very literal sense.
I forget if you mentioned any restrictions about the definition of "what we learn in school," but in case you didn't: I'd say about 90% of what we learn in school is how to be a functioning person anyway, so no, I don't think it's useless.