Advance Classes
     There are 8 of them in total. To unlock the advance classes, you need 
to level up the other classes to a certain level for them to show up 
in the class changing option when you talk to Chat. 
The advance classes require certain amount of grade points. 
You only need to pay the grade points once for every advance classes.

Bishop:             Cleric and Wizard Lvl30, 500GP

Dual Fencer:        Fencer Lvl15, 200GP

Large Fencer:       Warrior Lvl15, 200GP

Magic Fencer:       Warrior, Fencer and Wizard Lvl30, 500GP

Monk:               Cleric and Grappler Lvl15, 200GP

Ninja:              Fencer, Grappler and Hunter Lvl30, 500GP

Paladin:            Warrior, Cleric and Large Fencer Lvl30, 500GP

Pirate:             Thief and Hunter Lvl15, 200GP