I don't recall the book or the movie ever stating how the other contestants defeated their dragons.
We know that Harry

Used his wand to summon his broom to out fly the dragon

But how did the other contestants defeat their dragons?
What spells or techniques did they use?

I'm looking for a canon answer for the book or movie

I don't recall the book or the movie ever stating how the other contestants defeated their dragons.
We know that Harry

Used his wand to summon his broom to out fly the dragon

But how did the other contestants defeat their dragons?
What spells or techniques did they use?

I'm looking for a canon answer from the book or movie