Depends on what you like to play.
Ill try and write a good tut for you
Domination
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Karachi
Go to the A flag and get a team mate to watch to your left.
Then just sit on the machine guna and every so often keep firing a couple of bullets.
After so long you will get at least 1 or 2 people trying to kill you.
then just keep watching that door and dont get of the gun AT ANY COST !
After you have killed 1 or 2 people they will start to get anoyed and come after you
HQ
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Rundown
Wait until the HQ is under the little bunker at side of the wooden bridge.
Then climb onto the wall and up onto the sandbags to the machine gun.
Just like Karachri from there on.
Get a team mate to watch to your left and another to watch behind you.
Then tell your team to let them come over the wooden bridge to the HQ
I have done this many of times doing it this with.
Hope it helped.