you need +- 10000000000 Ep for 1 lv up. (in the World folder, you find a ChrCommon.txt and you have set by lv 121 93617185246 and by 120 83037947834 Ep.
93617185246 - 83037947834 = your Ep, what you need for 1 lv up)
set 10000000000 ÷ (how many mobs you need to kill for 1 lv up) = your MonExp
and test it self
pls note the Ep with using a 50% or 100% Ep Booster...
for your ExpRange is 1000 standart.
1000 = 100% from standart
2000 = 200% from standart
set your ExpRange to that, what you need and test it self