To be honest, not even the Exp Charms will yield you a much faster leveling, as it's the quests that really give the Exp in this game.
So the 2 easiest way are:
1.) Get a very good dungeon group and spam Dungeons. At your level, Crooked Vein and at 54 Mara's Cult Altar are very good places. The mob Exp combined with daily quest exp + guild quest exp will give you quite a bit.
2.) Another very efficient way is to gather a group of 5 people and spam map guild quests. If 5 people work together, you can kill the 40-50 mobs that are required per Quest in no time. You will also get good CP and Money using this method.
Edit: 3.) Almost forgot the arena! Each win in the arena gives you about as much Exp as completing a Quest around your level. So participate in it often and it should bring you on quite well.
Hope this helps you a little.^^