Yay for you. You were so smart reading, writing, and doing long division at kindergarten age. If only everyone else was so brilliant.
I was slightly ahead for arithmetic (but not by much), but I was at the very bottom for writing - to the extent that I was the only one having to stay in at break times for extra practice. This was not at a selective school (I started at one aged 7), this was at a school with a full mix of ability.
Its not natural or obvious how to use the three seashells. School is there to teach that.
That's rather my point. My school managed to teach all of us those things, what's wrong with schools in the USA?