Here is the proof. This can be done on any quests as far as I know. Its still in test mode.

First you will need to
level your character to Lv 30 to unlock the other jobs you can do. Or just get another War weapon or Magic weapon, or Hand weapon "Testing as of now"
dont do this until Lv 30, its not recommended as it may or will work but Lv 30 will work. Then decide what you want to level your next Job. Go out and fight about
Lv 5. That should be easy but only for some Jobs in
Lv 1. Okay when your ready pick up your
lv 10 Job and goto the camp that has the right
Levequest.
This is not recommended for begginners as you need to know your gear very well. I was only a lv 10 and had Def as 80, but with this method with CNJ/GLD I had defense to 125. With my method, Jesus its hard to believe that defense can go that high. Thats 35 points of defense points. Okay make sure you have the greatest Armor, rings, assesories, gloves, hats, attire, pants, shoes, ETc... That you can find! Thats the hard part as I will try to get a list together that works best as this method is redefined. I found it accidentally as i was doing a video for Facebook. As far as I know this works for CNJ Lv 30/GLD Lv 10.