(adsbygoogle = window.adsbygoogle || []).push({}); I've been doing this for a long time now.
Every time I prestige I'm leveling up till level 40 for the stinger.
Turn on the double XP and use the specialist point streak.
Choose only 1 perk and use hardline.
So after 3 kills u will get the specialist bonus (+500 a kill) and on top of that the double XP.
So for a normal kill you'll get 2000 xp. If u plant a bomb 3000xp etc.
If the enemy calls in a uav you'll pull out your stinger.
You'll earn 1000xp for a uav, 6000 xp for a carepackage chopper and 4000xp for a normal chopper I believe.
This way you'll earn 20k-40k a match easily.

NOTE THIS IS FOR SEARCH & DESTROY!
It's always best to spend your double xp time in S& cause in domination you'll lose 9 minutes and in search you'll lose like 5, because it counts the time your alive.
Hope this helped. Tell me if I forgot something.

Are you sure the time doesn't count when you're dead? I always thought it was time played and time played counts while you're dead.

Or, if you get support package as a killstreak and put the recon drone in the killstreaks you get 1000xp per spotted person, so you can get 6k xp per round for using this