Oh come on jim. You were clearly brainy enough to catch up!
My parents had loads of books for me to read so I was probably learning things that schools never teach, even in my downtime. I mean reference books.
Whenever TV news show books and kids simultaneously, the titles and cover art do not suggest reference books, to me. Probably Eezeereed material to a) get them to read *at all*, b) make it "fun", c) generally help them learn to expand their vocab and grammar, etc.
The abiding memory of my first day at infant school was puzzlement about why it was necessary to line the walls of the room with big letters, surrounded by pictures of animals and the word for the animal. I have zero recollection of being taught to read, not even by my parents.