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Before I begin I would like to stress how boosting is very unfair to genuine players who have achieved there ranks with legit methods, like myself. I don't advise boosting and don't recommend it.
I am now 4th Prestige on MW2 just by using these simple classes.
Rush Class:
Primary Weapon - UMP45 with Silencer
Secondary Weapon - Spas 12 No attachment
Equipment - Semtex
Special Grenade - Stun 2x
Perk 1 - Marathon (Pro)
Perk 2 - Lightweight (Pro)
Perk 3 - Ninja (Pro)
Death Streak Perk - Pain killer I never get to use this
High-powered Rushing class:
Primary Weapon - UMP45 with FMJ
Secondary Weapon - Spas 12 No attachment
Equipment - Semtex
Special Grenade - Stun 2x
Perk 1 - Marathon (Pro)
Perk 2 - Stopping Power (Pro)
Perk 3 - Ninja (Pro)
Death Streak Perk - Pain Killer
Sniping Class:
Primary Weapon - Intervention with FMJ/Thermal
Secondary Weapon - Spas 12 No attachment
Equipment - Semtex
Special Grenade - Stun 2x
Perk 1 - Marathon (Pro)/ Sleight of Hand (Pro)
Perk 2 - Stopping Power (Pro)
Perk 3 - Ninja (Pro)
Death Streak Perk - Pain Killer
Just use these three classes in Search and Destroy and you'll be fine. I usually get about 10,000 XP a match and sometimes extra with challenges. I have been doing this since the release of the game and it works very well for me .
Note: I don't usually play in party's but you get a lot more wins than experience when playing in party's, well really it depends on who you play with

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If I helped then your welcome in advance also please no negative comments this is to help people who don't want to boost but want to rank up fast