Final Fantasy 3 DS help?

Question

I'm curentley at the part where one starts climbing the crystal tower. My probablom is that I can't beat the Colored Dragons.
My party is a LvL50 Dark Knight, Sage, Dragoon, and Ninja.
The Dark Knight has Ragnarok and Masamune.
The Sage has Eldest Staff and Omni Rod and knows
LvL1 Blizzard, Fire, and Cure
LvL2 Thunder,Aero, and Icen.
LvL3 Thundara, Fira, and Cura.
LvL4 Blizzaga, Break, and Heatra.
LvL5 Thundaga, Raise, and Hyper.
LvL6 Firaga, Aeroga, and Catastro.
LvL7 Reflect, Quake, and Leviath.
LvL8 Holy, Arise, and Flare.
The Dragoon has Holy Lance and Dragon Lance.
The Ninja Has two Kiku-Ichimonji.
I refuse to change my party so please post info that has to do with my party's strengths. Also do not post anything stupid

Answer 1

i chose not to get that far in FFIII, but i do know that there is one part that you really need to turn everybody into dragoons, or else the game is hard as hell at that point.

you can always change back to sage, ninja, and dark knight later.

Answer 2

Well first of all you're WAY under-leveled! You need to be at LEAST level 56-57 around where you are and if you even want a chance to beat the last bosses you really need to start leveling up. also you REALLY need a dedicated Healer so you should really think about changing someone into a Devout. And be sure to level up those jobs of yours! Very important.