User blog:Section190/How to survive longer

So hey guys i've been playing call of duty black ops 2 recently and I have reached prestige 2.I played it for a while and asked myself how can i do better. I tried combat training but i still can't manage to survive longer in public matches.Can any of you guys help me out my k/d is really not that good i want to be a good call duty player and enhance my k/d.