Jade didn't start off as the greatest shot in her graduating class of Quarriors, but she certainly managed to graduate that way. Everyone who had known her back then always had some kind of speculation as to how it came to be (usually involving violence or threats towards those with lower scores).
Jade, and Graveheart beside her, knew the truth: Jade was the best because she worked at it. It was just her way of living. If she hadn't put any amount of blood, sweat or tears into something, then she had never been serious about it to begin with.