Well, I played conquer for bouts 3 years before their new "greed" patch. Not sure if anythings changed but;
(Archer guide btw)
Level 1 - Go to ape mountain & get pleveled to level 40. (Doesn't matter if you promote at 15 or 40, either way you get the same stats and skills).
Level 40 - Get promoted and go to Desert City to get Pleveled til 48-50.
Level 40+ - Assuming you looted, Fill your inventories with arrows and pots and get to adventure zone (i think thats what its called, haven't played for a while). Go to alien serpents and continuously jump and scatter in a circle. This will lure them together and your scatter itself would get you pretty good EXP. (Your not aiming to kill). This works til around 100+, then you can move down to basilisks. If you can, try to get into a party with a fire tao or other archers.
(This was from personal experience, I'm not sure if anythings changed.)