You will be most qualified for a job you have most skill points in. So if you have a character who has most points in intelligence, you should try for an intelligence job. Trying for a job with the least skill points will usually mean rejection.
If you are rejected for a job you are qualified in check to make sure your character is not too overweight. If you can get the tama to a 'healthy weight' under 60lb, you have a better chance of being accepted.
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