First make a single player terrorist hunt on presidid on realistic. When you spawn go to the left and go crouch in the corner with the rappel rope next to it.
Now throw a smoke canister at your feet then wait 3 seconds and throw another or it will die out to quickly. Now wait with thermal vision on and about 7 to 9 guys will crowd up right in front of you. All you have to do is shoot with your shotgun to get CQB points. If you want assault points plant a C4 about 6 feet on the sand bags across from you and when they all come BLOW THE LIVING CRAP OUT OF EM!!!!!!!!!!!!! I hope you like this hint