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Ok You need to start this strategy at level 1.
So from the lvl 1-30 make SnD ( You need to be good x) )
Now you are level 30 you will do Demolition because when you are in SnD you dont realy did alot of challenge.
So, if you are good maybe you will get 10 000-25 000 exp per game
so 30-45 you get it really faster 45-50 do it normaly ^^
That my trick so... let play black ops
ps: I hate all the people WHO BACKSHOT IN SnD x)