Mario played 3 seasons of junior hockey. Including playoffs in 81/82 he played 82 games and got 35 goals and 110 points.
In 82/83 he played in the World Juniors and playoffs in 85 games and got 103 goals and 226 points.
In 83/84 he played 87 games including the playoffs and Memorial Cup and got 163 goals, 174 assists for 337 points.
He improved by 116 points his second year of junior and 111 points in his third junior season.
Gretzky has the more absurd, ridiculous numbers in the NHL but Mario has the most insane junior career of any player.