Well, there are two key tips for cheating on equipment (item-dupe trick) and JP (get a crapload), but I won't tell you them yet.

Each Job requires a you to be at certain levels of other Jobs -- Just as you need to get to Lv. 2 Chemist before you can get to Priest or Wizard, some Jobs require you to be at certain levels with multiple Jobs. But you also, I believe, get JP for certain Jobs from other party members of that Job who gain JP. Like, if you have a Monk in your party, for every so many JP he earns, if Ramza's in the same battle with him, Ramza will earn some JP for Monk, too. I have characters with eight and nine hundred JP in Jops they've never been before. A little more, and my Ramza will have Hamedo.

Make the guy who's mastered Knight into an Archer, and give him a bow, never a crossbow. (Crossbows have a fixed range of 4, but Bows have a range of 5, plus they can shoot over things, plus their range increases when you're at a higher altitude.) That way, he can do his Break abilities from a distance.

Make your women your magic-users, as females have higher Magic and lower Physical power.

And get Ramza some new abilities. Sure, the equipment is nice, but keeping him alive doesn't help much if you can't do much with him. I'd go for Lancer (then you still get the heavy armor, plus a weapon with a range of 2, plus the Jump abilities, PLUS -- and this is a big one -- the Ignore Height movement trait, which helps out quite a bit), or Ninja when you get it, or Samurai. The Two-Sword ability from Ninja comes in handy, as does the Two-Hands from Samurai -- especially with Counter.

My brother swears by Calculators. I've never been too interested in the random stuff, but he loves the Math Skills.

While you're at it. If Ramza has mastered Squire, he should have Cheer Up, which raises Brave by 5. Use it. Use it every chance you get. Because even though it's only up 5 until that battle ends, for every 4 it goes up or down, 1 is permanent. So if you raise your Brave four times in a battle and it's twenty more than what it was before, when you get out of the battle, it'll permanently be five more than it was before.