It isn't a matter of ability points, it's a matter of attribute points. You'd need enough Dexterity for the bow, and enough Intelligence for the spells... and not much left over for Constitution, Speed, or Perception.
This is what I mean, if you go too wide you'll end up being mediocre at everything. You cannot be a powerful mage AND a powerful warrior AND a ranger since you have to split between intelligence, dexterity and strength.