I had Crisma at the time, so I couldn't come, I hope next year I'll be there!
It can have one winner for the whole school, at the end the winners of each category can compete with words of the level of the person and see who wins.
Example: the one who wins from the starter will compete with the one who wins in the advanced and the winners of the other categories too, but the person in the starter will answer starter words and the person from advanced will answer advanced words.