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Pick your favorite gun, then put these perks on:

-Scavenger
-Hardline
-Ninja

Equipment: Anything you want.
Special Grenades: Anything you want.

I use UMP45, M16, AUG, FAMAS, and SCAR-H with this. You can use whatever you want as long as you rack up kills with it.

Put your killstreaks as:
Care Package
Predator Missile OR Harrier Strike
Chopper Gunner OR AC130

With Hardline, it takes 1 less kill to get these streaks.
Use your gun, play tactical (not CAMP), and get kills.
With a Predator Missile hitting multiple people, you can just run over all of their bodies with Scavenger and easily finish the challenges.
(I got Scavenger Pro VI in 5-6 games, I got two of them in just one game.)

With this you will find that your K/D spread will be much higher if you get killstreaks and a LOT more ammo.

When you get Scavenger Pro, you get extra magazines! (like CoD4's Bandolier), and it is much easier to get than the FMJ Extra Mags. (I don't know if you can double them up.)

If you want to get more XP and let your K/D drop a little, die every 2-3 kills and keep getting mini-killstreaks for the Hardline Pro Challenges.

One game, I went from 43-44 with this method (and the game before I just became 43.)

Scavenger is so easy to get the challenge for. I wish I started earlier. I just started earlier today and already got to Scavenger VI.

Prestige and use this tutorial then. :p

after the scavanger challenge is done, you should really switch to one man army.

Same here, i have all those challenges completed already.:cool:

I do the gun challenges so since i prestige there is 2 challenges for each amount of kills 250,500,1000 so that means i get 20k points for completing one challenge which is actually one

Sweet, haha. I should do that.

I already completed scav pro completely like you said it was easy and good xp. Doing a lot of challenges does help you rank up.

im guessing unlocking all the stuff like PRO for perks and challenges gives you lots of XP and you level. which is a very good idea good way to level.

Yeah I'm just saying aside from Stopping Power, Hardline and Scavenger are the next easiest to unlock.

I just tried this it works omg!
thanks bro