Hey TTG. With this amazing tool I found you can mod all of the call of duty stats to make yourself highest prestige. These hacks won't work with your challenges just yet, the update will be adding more support as exploits are found.
CoD4 mod menus are supported, Linx and FlyingTurnip mod menu patches are included. You use your usb to mod the game. Instructions are inside the program.
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More info:
CoD MW2 and Black Op stats are also editable so you can choose your desired level.
MW3 hacks are limited. You can mod your prestige tokens to be a really high amount and mod your gametypes. Some gametypes have been included, such as Knock Back and Care package mods.

If you have any questions, feel free to message me.