Short answer: None
Long answer:
Only bot that would possibly work decent on qonquer would be a proxy based bot that you modified yourself to account for the random questions as well as other protection measures they have in place.
It will auto ban from speeding if you use a fast bot, it will auto dc if you don't get questions correct, it will auto ip ban (till restart... might have changed now) if you do proxy-esque type jump attacks.
So basically you're best of leveling yourself on it... it's not that hard. I've done it quite a few times lol