This is a little thing I did to help new players (I'm a little bit new but average 50 kills a game)
1.At bridge wars ALWAYS use SMG til new weapons come.You can snipe with it, too.
2.Stay crouched at all times exept when you are running to more cover.
3.Don't be afraid to throw lots of gernades
4.Be organized.Create squads,give them missions,have a team captain.
5.Most people get in a hurry to place there airstrike when they get it because they don't wanna die.If you need to let the other team get in the place you wanna bomb DO IT!
6.Keep your tunnels clean.What I mean by this is some tunnels have blocks everywhere and 1 block deep holes.That only slows down your team.