KILLSTREAK: sentry gun, attack helicopter, Dogs
My idea is to do demolition. When you are attacking plant the bomb lots of times as the attacking people get 600 points for planting then obviously defuse. Do this until 30 seconds left, at 30 secs plant it then your partner tries to defuse - kill him to get the extra points for killing someone who is defusing.
After this once you have killed him make him spawn by the fence, ( kill the guest then run to the brown fence where he started and stand against it then spawn. The guest will be behind the fence. aim at his head then slowly move out and shoot him through the fence. He should keep spawning there.
Do this until the end until the round - be sure to kill your self on occasions to get more killstreaks = more points .
Next round - You will not get kills as fast as you cannot do the spawn glitch thing. Make the guest plant the bomb, you can defuse a few times if you want however i prefere to get kills.
Call in all of your killstreaks and stand in a specific location so the guest does not spawn to far away.
Now control the guest- fire your gun for the dogs attention. Make sure you spawn quickly. Also set up the sentry gun in the garden where the guest starts meaning it can kill the guest when he spawns.
I found this very useful getting from lvl 45 -50 and prestige
YOU SHOULD ALSO BUY CONTRACTS LIKE THE HEADSHOT ONES AND DO CHALLENGES FOR MORE EXP