The guide made by A 2rue boofer is great! I'll just post the way i boost it :)
Minimum of 4 players search for a ranked match of VIP on camp 20 minutes, 1 booster goes for kills in 5 minutes the rest just runs to the road, then the next booster is up! You rack about 50-60 kills a match!
(also good to do with 5 players but then u play 4 minutes each!!)
Good luck and hope it helps u out!!