Level(Maple Story Mesos) 55-65: which are vulnerable to holy attacks, you will be able to find them in the haunted house in NLC. Truckers continue to be a nice alternative if you can get a spot. Other than that, there's no other special trick other than using Hyper Body.
Level(MapleStory powerlevling) 65-70: Hunt Windraiders or Mix Golems, almost 3 times less HP, and 4 times less EXP, depending on how much damage you deal, until you reach level 70. Windraiders are the monsters that give the most EXP until level 70. Hyper Body is still helpful, and after level 70, make sure to master Spear Crusher or Polearm Crusher.
They are the quickest and strongest skill for Dragon Knights, and followed by Dragon Roar, a dangerous move. Other skills can be added at your discretion, but find the skill build to do this, and after level 70 in Maplestory, go to El Nath and talk to the guide.