What...? There are two "mage" classes; which one are you talking about.
It's easy to level in this game. Rangers seem to have the ideal aoe to kite but getting the mats to make the aoe costs a fortune. Conjurers tend to level fast because they can kill faster due to high dmg.
I see, just depends on how you grind and the quests you get. Be on the look out for the 2x daily bulletin. If it says humanoid then go to the bulletin to get quest that will kill humanoid type mobs.