Keep Moving (Don't Camp)

Don't use an explosive weapon at close range

Make it easy to switch weapons

Relook over and memorize your keys for the game

Get to know the maps

Get good at the weapons and know the ranges

Practice hard

Don't use a joystick.... I mean you can use it.... But may the force be with you....

If there is a mass amount of enemies use an explosive weapon, even at close range

Juke around, and learn to compensate your movements with your crosshair

Get used to the gravity in the arena, If lower gravity you can jump in good places to hide and attack