I need help on lvln in cod mw2 on ps3!?

i need help on lvling on mw2 on ps3 i usualy either play ffa or tdm.i get about 1000-3000 every ffa and about 2000-5000 on tdm if i play search i get like 5000-7000 i use the ump45 and the intervention with the spaz and the usp