You can only start the game with a kit.
The reason the NPCs (Imoen and Nalia) are Thief > Mages rather than Mage > Thiefs is because it's much more powerful that way.
You get more HP, and advance in the more powerful class.
If you find their skills subpar, then you need to stay a thief longer than Imoen (7) or Nalia (4) did.
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Baruk Khazad! Khazad ai-mênu!
"All that is necessary for the triumph of evil is that good men do nothing."-- Edmund Burke
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