1 - 60 - ur respective campuses
60 - 80 - campuses hole(ex. SG hole)
90 - 128 - Trading Hole
128 - 191 - Middle Hole
191 - 260 - HeadB 30f
no need to do quests just ride the bus
this lvling guide is 1 kill 1 lvl from 1 - 260
in head b 30f kill the blue seargent and bazooka they give a lot more xp