If you really want to earn quick experience points, buy the best stuff you can get. Then, export your player and import them again.
Save your game and steal from the room in the candlekeep inn with the nobleman standing there. You will be attacked by a guard (if you loose just restart your saved game).
Then, if you're really brave go downstairs and (save the game), then attack the mage (I forget his name).
If you win you gain 2500 EX points (and the rabe is worth a lot of gold). If you loose- reload the game and try again.
Then keep exporting and importing your player and the EX points come rolling in!!! (your character's likableness is reset everytime you restart).
If you need more help, we've got more Baldur's Gate cheats and also check out all of the answers for this game
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