I know how ya feel. I got 50 in war, pal, whm, sum/sch, and bard and now am working on the last 3 classes.


Do fates, leves, roulettes, dailies in between dungeon queues.

For fates, try to find teh zoens where less people do fates period, as those fates will be easier. if the fate is not soloable, wait till timer is down to last minute and just do as much damage as you can. you still get decent exp for failures.
For leves, always do the maximum difficulty.

when in dungeon verbally request to kill everything for exp. most people are ok with this.

Key things for certain dungeons:
Haukke: you can't open every door. make sure to save a key for the last door, there are 4 extra mobs in there for exp.
Brayflox: make sure to explore all the hidden areas, as mobs will spawn on the gobbies. extra exp.
Aurum Vale: let the seedlings hatch. you get exp for the seedling hatching, then like 15x more exp for killing the spawn. this equates to about an extra 60k+ exp per run.

always do your low level and guildhest roulette for the jobs your levelling.

if your absolutely out of stuff to do inbetween even fates, find the highest level mob that drops sellable goods in the down time near a fate spawning area. atleast make some gil while your at it.

if yo do this it won't be too bad. About 3 weeks ago my bard, monk, dragoon, and blm were level 20, 20, 20, and 26. Now their level 50, 44, 41, and 40. I estimate in about 3 weeks they'll all be 50, so it's definately
doable with some planning.