To become a Ninja you need to A abilities, I suggest Steal: Gil and Steal: weapon, Also, Before you make him a ninja, make sure he has counter and combat combo.

Do that with another soilder and then keep them close together for the combos.

For Pladains, you need 2 Soilder Abilities.

And for the Bangaa's, 2 White Monk Abilities gives you Bishop and something else, and 2 Warrior abilities gives you Templar, Dragoon and Defender [I think]

"Progression - Job Class - Final Fantasy Tactics Advance - Eyes on Final Fantasy"

Is Wrong, on one part, you need Two archer abilities to become a hunter, not one as the site suggests