A path by age
Ages 4–6: listen, then find the same note.
Ages 7–9: five fingers, thumb on C, little finger on G.
Ages 10–12: add the left hand.
From 13: mock grades follow the shape of several countries. Passing is an accuracy score inside this app. No exam board issues a certificate for it.
This is not an official exam piece, and it is not a score published by an exam board.