If you are good, play SnD on core.
Kill 5 enemies plant a bomb, kill last one, repeat 3 times, then kill 5 enemies, let the last one plant, then kill him, defuse and if you could make 20 seconds a round, then its around 110 sec and you just earned around 20k XP and loads of cash. Repeat until rich/ranked up.:bro:
Seriously I play SnD and ranked up from 1 to 41 in 7 hours. Didn't know the maps (release day) so i might do it faster on next prestige. Got a lot of CP too. Good luck.
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all are around the same speed for an average player, but if your good and can plant a few bombs try SnD at level 20 i averaged around 20-40k exp per game 1-3 levels per game
demo on nuketown is also extremely good if u can get upto 7 9 and 11 kill streaks (and have a resonable team), ive went 304 kills for 26 on nuke town useing those kill streaks level 13 to 19 in 1 game ftw
USE DOGS they are teh shit :mudkip: 1 "dog streak" can easily get u 15-25 kills on nuke town