Get twelve people in a lobby, and explain how the level boosting is going to 
work. Next, kick six people out so there are only six in your party. Then, find 
a Search And Destroy game. Note: While trying to find the game, make sure the 
host (the person trying to find the game) temporarily has a bad connection so it 
will make you host the lobby and not pair you with someone else. Once you are in 
the lobby, you can invite the other six people to join. When all the spots are 
filled, you can make your connection good again and begin the match. Choose a 
class with the riot shield. It is recommended both players use the One Man Army 
perk if you have unlocked it. Once the match begins, find another player, and 
have them keep shooting you while you hold the riot shield to block the bullets. 
You will get +500 experience points every few seconds five times. Once you start 
only getting +100 experience points, switch classes and have the other player 
switch to a riot shield class. Do the same things to them until they only get 
+100 experience points, and then switch back. Repeat this as many times as 
desired. It is possible to get over 50,000 experience points per match if done 
correctly. Note: To keep the game going as long as possible, make sure one team 
plants the bomb and then the other team defuses it.