Have some of your party members learn the Monk skill and Move HP. Next, change them to Lancers and learn the Level and Vertical Jumps. Then, switch them to ninjas and learn the Two Swords skill. When they become Samurais, your party members will now be able dodge arrow attacks, gain hit points while moving, and deliver two powerful sword attacks to an enemy. Learning a Counterstrike skill is also recommended.
When you start the game, be sure to have all your Squire's JP points and skills up. Switch them to Chemists and learn the Potion and Phoenix Down skills. When the Chemists get to level two, switch them all to Wizards and equip the Item skill as your secondary power. Be sure to keep your party members as Wizards until they have reached third level Fire, Ice, and Bolt spells. Then, turn your Wizards back into Priests until they reach level two. Next, turn them all into Oracles and learn the Move MP Up skill. After that, turn all of your Oracles into Time Mages. After a while, you'll be able to turn your Time Mages into Summoners. Learn the skill, Half Mp. After all this has been done, your party members should be regenerating Mp while they walk, and you should be able to use spells at a lower casting rate. For example, a Wizard with 43 Mp can cast Fire 4, twice in a row. Another example is the Summoners. Get all these skills lined up and you'll be able to cast spells like Titan and Bahamut multiple times. And when you have three, even five, members doing this, the end results are devastating.
When you start the game, switch Ramza to a Chemist, and make sure you have four other female soldiers -- hire them if you have to. Turn the female soldiers into Squires. When Ramza learns the Chemist skills Potion, Phoenix Down, Antidote, and High Potion. By then his level should be at around level eight. Now, get all four of the female Squires and turn them into Geomancers -- make sure they learn a lot of the skills like Hell Ivy, etc. Keep changing their classes until they become dancers, keeping the Elemental spells as a secondary skill. Be sure to learn all the dances. Now, it's going to be a while until Ramza becomes a Mime, so be sure to keep changing the female soldiers classes around so that they can all become Calculators, keeping the Dance spells as their secondary skill.
Now here's where the action starts. When you have four Dancers and a Mime, you'll now be able to attack a lot faster than most of your enemies. For example, if you use Slow Dance, you can knock off as many as eight speed points -- they're slow pokes! And since all the Elemental spells are free, meaning they take no magic points, this team is especially lethal.
By this time, you should have at least one player that's eligible to become a Bard or Dancer. As a mental note, Bards and Dancers gain JP really quickly and learn their skills a little faster than everyone else. Be sure to build one of the female Squires into a Calculator, and be sure to make one of the other one a Mime. As a warning, you'll never make it through Chapter Four without one of the two.
When you get to Irgos Castle, buy be sure to get a couple archers built up -- be sure to learn Concentrate and all the Charges as soon as you can. When you get to Chapter Two, you should come across a guy name Mustadio in Goug, the Machine City. Buy some guns and change your Archers to Mediators. This will allow them to use guns, and with the Concentrate and Charge abilities at your disposal, you'll be able to pick off your enemies one by one.
Without a Calculator, you will be defeated. So before going into the final battle at Orbonne Monastery, be sure to have Demi 2 (Time Mage) and Petrify (Oracle). These spells will help you out immensely. Math skills rule. The more you have, the better off you are. Also, be sure to have a Mime. They're perfect back-up for your Calculators.
Now that you have your party lined up, make sure your levels are built up and your supplies are stocked. The best place to do this is after the battle at Murond Holy Place. In fact, this is the time where youcan acquire Cloud.
Be sure to keep those Holy Knights beefed up, especially Orlandu. His sword skills are unmatched and super strong.
Once you get past Chapter Four, the maps and terrain get a little tougher. If you have Lancers, their Ignore Height ability is really useful against any hand-to-hand combatant.
Ninjas are also good to have, or at least some of their skills. Especially if you rely in sword users. The Two Swords ability allows a player to equip two swords at once.
Obtaining the Ultima Spell
Once you get to Chapter Four, make sure Ramza is a Squire. He cannot be in any other job class. When you battle the assassins on the roof at Riovanes Castle, they need to cast the Ultima spell on Ramza before he can learn it. Be careful, though, if you kill the assassins, they'll turn into Ultima Demons. Eventually, Ramza will learn the spell.