Don't know about 12 exactly but at 14 I would say try the bandit camps in East Karana. Can be tricky, but collecting the sashes is a good quest.
When I was 16 or so I tried the entrance areas of Permafrost and Runnyeye. Nice XP per mob, and a zone at your back for when it goes wrong, as long as you don't try going too deep in. Permafrost has a longish respawn time, which may or may not be a downside.
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