What about those who don’t know they know? These should be rarer than the first type. An example I can give is about my daughter.

Her favorate TV channels are 23 and 31 (both PBS kids and WGBH), when she turns on the TV, she would ask shall I push “up” or push “down”. I usually tell her:”it depends on where you are”. But if she remembers that last time she reached 31 by pushing “up”, she would just be pushing “up”. Of course she has been right all the time since as long as you push “up”, you will reach the channel you want.

I know she can count up and count down, so she should know how to reach the desired channel most efficiently. In this case, she DOES NOT KNOW SHE KNOWS. Then I figured out a way to teach her: “we are living on the 27th floor, if you want to go to 23rd floor to visit your friends, should you press up or down?” She has no problem to answer this question. Then the next time when she needs to find channel 23, I would ask her:”think about the elevator example, now we are in 31st floor, should you press up or down to go to 23rd floor?”

She answers:”for elevator I press down, but for TV, I press up, ’cause I can find 23 by pressing ‘up’ each time”.

She has a point.

There are three types of people in the world.

Those who know (a very rare breed).
Those who know they don’t know.
Those who don’t know they don’t know.

At the very least, you will be moving up to category 2.