The battle tower trainer can let you unlearn your skills and re-assign the skill points (for a price, which doubles each time you do it). There is no way to re-assign your stat points, however. You will need to use a few charms to get your dexterity up, find some stat books / mindreads, or wait until you go up a couple levels and have enough stat points to invest (not sure what the dexterity requirements are for a magical bow; a balanced bow I checked near the end of the game had a 14 requirement for dexterity and intelligence, while a normal bow had a 29 dexterity requirement).
Skill Books/Stat Books/Dragon Skill Books Complete (spoilers)
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