Q: What is job level?
A: Job level (Job LV) is a renewed system in the DS system. Each character can
have at most 23 jobs, each job comes with a Job LV, showing how proficient
the character is at that job. Maximum Job LV is 99.

Q: What does Job LV do?
A: For all the jobs, Job LV enhance battle performance by increase number of
hits, chance of hits, physical damage, magical damage, magical recovery,
etc. For some specific jobs, Job LV enhances their special actions, too.

Q: How to increase Job LV?
A: Every character has a hidden stat called Job Point (JP) that dictates their
Job LV growth. When JP accumulated to 99, job level goes up by 1. Each
action (except step forward, step backward, escape, and hi-escape for thief)
will contribute a fixed amount of job point to the character. The amount
contributed follows the rules below:

1. For all the jobs before job level 14, each valid action will contribute 20
job points. Exception is scholar, who has 24 points per valid action.
- This mean for every 5 actions your character should gain one job level
when they are below job level 14.

2. For all the jobs higher than job level 14, each valid action will contribue
different amount of job points, according to what job you are using. Here is
the list:

/---------------------\
| |Job LV |
| |-------|
|Jobs |<14|>14|
|---------------------|
|Freelancer | 20| 20|
|Fighter | 20| 14|
|Monk | 20| 14|
|White mage | 20| 10|
|Black mage | 20| 10|
|Red mage | 20| 12|
|Ranger | 20| 14|
|Knight | 20| 12|
|Thief | 20| 18|
|Scholar | 24| 24|
|Geomancer | 20| 14|
|Dragoon | 20| 16|
|Viking | 20| 14|
|Dark Knight | 20| 14|
|Evoker | 20| 10|
|Bard | 20| 18|
|Black Belt | 20| 14|
|Devout | 20| 10|
|Magus | 20| 10|
|Summoner | 20| 12|
|Ninja | 20| 12|
|Onion Knight | 20| 8|
\---------------------/


I hope this makes sense to you folks, i know that i was wondering about this for a while. It seemed like my black mage was job leveling like crazy and my Onion KNights where not doing anything. lol