What's these quests you are talking about? I had 82 Cata quests completed on my first alt when I dinged 85. And at this point you are most likely leveling an alt with heirlooms. Without any XP modifiers you would either do Hyjal or Vashj'ir and then proceed normally with Deepholm, Uldum and TH. With heirlooms you can skip 2 zones in most cases. Even 2½ if you do instances and BGs a bit more than average player.