Have you known that monster's all have a job type assigned to them,and thus certain jobs are ideal to grind on because of their weaknesses?Here i got a guide for this from the DOMO forum This is a list of all jobs, and their general monster traits.

Summary
Swordsman should fight:
-Wizards that don't cast spells
-Dancers
-Swordsman
-Hunters

Thieves should fight:
-Wizards that don't cast spells
-Merchants
-Swordsman

Shamans should fight:
-Wizards (Any)
-Swordsman

Doctors should fight:
-Wizards that don't cast spells
-Go duo with someone.

Martial Artist:
-Anything except spell casting wizards.

Citizen
-Moderate HP
-Moderate Damage
-Moderate Accuracy

Not much to say, pretty much an all around monster class to fight. No weaknesses, no strengths.

Swordsman
-Low HP
-High Damage
-Low Accuracy

High agility characters can usually kill Swordsman types while only taking 1-2, if any hits. Shaman's can also kill these usually before the mob even touches them. Generally, Flowers are Swordsman.

Wizard
-Low HP
-Low Damage
-Moderate Accuracy
-Sometimes casts elemental spells

You'll sometimes find Wizard types that don't cast any magic at all, and if you do, they're easy prey for any job.

Merchant
-High HP
-Moderate-Low Damage
-Moderate Accuracy

Merchants can vary pretty greatly, but these types are also great for agility types.

Dancer
-Low HP
-Moderate Damage
-Low Accuracy
-High Skill/Magic Evasion

Dancer's evade any skills and magic pretty much at 75%, simply put, you shouldn't be fighting these if you rely on skills.

Hunter
-Moderate-High HP
-Low Damage
-High Accuracy

These are great for classes that don't generally evade.

Musician *Credits to Kris
-Moderate HP
-Decent Accuracy

Mercenary *Credits to Kris
-Moderate HP
-High Defense
-Moderate Damage

Witch Doctor *Credits to Kris
-Low HP
-Debuffs

So,when you look through,you may know how to kill these monsters.Goldceo will help you in the game,if you need domo gold or DOMO Powerleveling,plz click the links.Thx for support.