Don't bother levelling at the ship graveyard. The jacole cave is much better if you'll trade your thief (or anything else) in for ninja to get throw. of course you also need magic, but it's like what, 10 ap to get to use level 1 black magic? So you really can't keep your original classes, but geeze, it's SO MUCH EASIER.

It's the cave with all the squirrels. the nice brown ones will always give you 2 ap and they're dead easy to kill.

the grey ones will give you five no matter how many you run into. which can sometimes be a lot if you hit them with a black magic before they run away. or kill you all. whichever comes first.

but, throw and black lvl1 are immensely awesome in this. (you'll also want white magic abilities since healing is a pain if they accidentally get you. phoenix downs are a bit expensive at all times)

but it goes as such: encounter a grey squirrel, have you fastest person with black magic (which means that maybe you'll want to fight five/ten battles and give faris black as a secondary ability) cast something like, fire. providing you're still alive, squirrely will disappear and SIX (or seven or so) will pop up. Smack them with a water tech (or a flame tech. or a bolt tech. If you're playing the non-snes version, these are called scrolls?) bye bye squirrelies.

600 exp for all, 5 ap, and about 600 gil. provided none run away.

and jacole cave is easy to get to, the only thing is flying back to lix (or rikks?) for free healing. (or if you're sailing, that'd just be hideous)
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in the second world, there's a lovely castle south of the first town you run into, when you're free to run into towns. It's immensely deadly unless you can control the nice dragons. Again, have your fast person (hello faris[or bartz even]) use the secondary ability control (level two tamer, right? the dudes that use the whip.) every time you see a skull (skele?) dragon. they should turn around, and you're free to use their flame attack on them five times until they disappear. (four times if you've got dancers and they use sword dance a few times that doesn't uncontrol monsters, apparently. which is awesome. ) actually, dancer is an AWESOME class to have everyone as, or not. I dunno. but it's still pretty awesome.

Or, if you're into less deadly methods, wait until a little further into the second world, where you get picked up into a certain castle. go to the basement, with a lot of softs, or with a lot of MP and level 5 doom, and kill the stoney soldier dudes inthere, for 2-8 ap a battle. depending on number of soldiers you fight.

(luckily they can only cast break once, then they run out of mp. but, if you dance it out of them, they won't be able to cast it at all, and you'll save on softs, *and* get mp out of the deal! yay dancers!)

8ap>5ap+exp>5ap+lessexp>3 ap>2ap>1ap>

you can easily master several job classes in that basement. go for it.