It should tell you what position you finished in when you check the rewards window after the event ends.
As for why the event didn't appear I'm not sure. Are you on the latest version of the game (5.2.2)? Sometimes it won't pop up for people in an older version of the game.
Also, this current full marks seems as if it's not really thought out much by JC. The rewards are lackluster, likely due to the fact that year 8 players can't complete a lot of the tasks due to the prerequisites not being available and therefore have no chance of winning.