Here is a small trick courtesy of Diablo 3 Hero ( Try it out, they have a 60 day full refund!). This trick is easy, but requires that you can get a friend to help you - you only need one.
Here is a run down of the triple EXP Method:
- Kill a boss for a quest ((Say azmodan NM for 88k exp))
- Leave the game w/o turning in quest. ((Your friend stays in game.))
- Make your own game using resume game, turn in the quest.
- Return to your old game. Your friend now leaves the old game & makes a new game.
- Turn in quest a second time in your old game. ((The one he was babysitting))
- Join your friends new game, and turn it in for one final time.
In this method, you turn in the quest 3 times from a single kill. ---- Though your friend only gets 1 turn in
Round Robin Method ((Both you and your friend get 2 turnins)) :
- Steps 1-4 are all the same.
- 5. Wait in the old game while your friend turns his quest in, in his private game.
- 6. Your friend returns to your game that you were babysitting, and you both turn the quest in for your second time.
Triple exp = great to power lvl friends if you're lvl 60 already.
Round Robin = Good for you and a buddy if you're both leveling.