What is the quickest way to gain exp in GC Offline?

Thanks i try im lv 153 atm so hey gotta keep it up

Xp weapons help too. S rank mech guns in particular

All depends on your level really, I am 153 Force and I do Central Control Area and Seabed over and over I can get both done within 1 hour and 10 minutes and it gives about 170k - 180k EXP . Doing Temple and Spaceship give an extra 100k about if your up to doing them, in my opinion there both harder then seabed. ( but thats just me :3 )