Found a decent way to level up your classes (covered my name)

I ran down there, waited til my pet got there, used speed boost and ran back up, the location is good enough where I can shoot at two of them without moving, and the third one by just moving like 2 inches.
In addition, the spawn rate is good enough where as soon as i kill the 2nd one, the 1st one respawns and vise versa
been doing this for 20~ class levels on engi and i started getting people that copy me >:( (eg: guy right next to me who decided to level his ranger after standing next to me watching for like 5 minutes)