Huh, interesting, 6th-level spells in a class with poor base attack and d6 HD.  I guess if one was a 10th-level Black Mage and 10th-level White Mage, they'd only have 5th-level spells.  Or there's going Black Mage/White Mage/Archwizard for maximal dual-magic potential, though that's a long-term ideal.  A Scholar gets some unique skill in playing between Light and Dark from the start, as well as exploits.