I normally just go into a demo with a group of 6 and just spawn trap I can get level 50 in 2-3 days with only playing about 3 hours a day.

play demolition and search and destroy if your not very good though i would'nt play either but if your good i would play these

You should just do spawn trapping in demo I get about 50+ kills a game and if I get a lot of killstreaks i got around20k exp a game. Reccomended class is:
FAMAS extended mags w/ supresser
Dual wield pythons
semtex
willy pete
Tactical insertion
Ghost/ pro
Warlord/ pro
Ninja/ pro

It's a great way to lvl up, I prestiged to 1st a week ago and now im 2nd prestige lvl 28, so cheers m8

ALEGITMUFASA wrote You could always boost if you really wanted to but i wouldnt cause you might get reset

you will get reset.
and headquarters just try and capture it everytime

you really shouldnt be asking ppl what guns and kill streaks to use, the can be varied and depends on what type of player you are and the kill streaks depend on what kind of streak you can get, if you can get an 11 streak every game then run black bird, chopper, dogs, if your like me and cant get a streak to save your life then run something like uav, sam turret, care package