I have no idea how you say "It's Impossible".

I did the Rankquests when i was able to accept them. And there was only one which was "a little hard", since that time there were no Tips around. Quest was Futures Perfect. At a range from 1 - 10, where 1 is easiest and 10 hardest, all the pre-quests before Futures Perfect were between 1-5. So nothing i would call "Impossible".

And some quests were just a little harder cause it took a while due a lot of running, which i dont care about.