Quote:
Originally Posted by Calinda
With the +XP skill maxed and Tactics Treatise on top of it for +10% extra XP it is pretty possible 
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Tactics Treatise isn't in my current game yet!

For the XP skill maxed that's Paladin skills so not so easy to increase them soon for a warrior and a mage.
There's also a set with the Tactics Treatise and Bloody Band that bring +5% XP bonus.
I haven't check with your savegame you provided but I bet that to reach level 11 even with xp bonus at some point, this requires to have done most if not all quests and fights in the first 4 area, that is incredible in a so short time, very impressive.