Quickest Ways to Rank Up in Call of Duty 4

Search and Destroy

• In this mode, the object is to plant the bomb on either objective a or b, or if you are on the defensive side, to keep the other team from planting the bomb. To level quickly, rack up the points by completing the objectives. On regular difficulty, you get 25 points per kill, 100 points for planting the bomb and 100 points for defusing it. In hardcore you get 50 point per kill, 100 points for defusing the bomb and 100 points planting it. Plus, you get match bonuses at the end at each round for a win or loss depending on how many UAVs you get, how many air strikes you get and how long you stay alive.
  
  

Cage Match

• For this mode, get a friend to help you and choose guns you haven't done any challenges with. Shoot your friend in the head over and over again. Each time you shoot your friend you will get 20 points for the kill. For the first 25 kills, you get 100 points for unlocking your first attachment and it unlocks your first camo, which gives you 100 points. Get 75 kills for your next attachment, which gives you 500 exp. For the camo, get 75 headshots to get 500 exp. Get 150 kills to get your next attachment and 1000 more exp. Get 150 headshots to get another 1000 exp. You get match bonuses for UAVs, airstrikes and helicopters used in the battle, too, so the points really rack up.
  
  

Hardcore Headquarters and Domination

• For this mode, get a team of six friends together, capture the first headquarters and hold it until you get to 220 to 230 points. This will ensure that everyone on your crew gets 220 to 230 points, minimum. Sit around the last headquarters instead of capturing it. Kill people as they approach to rack up points. Think of this strategy as bait and trap. In the last 30 seconds, cap the headquarters to get the last 250 points in the game.
  Domination is the same as headquarters except that you have to hold three points on the map. They are constantly active so the longer you hold these areas the more points you get. Also, the more locations you hold the more points you get.