A void Fusion rifle is preferable, but a shotgun or auto rifle should do it. Play team games, as there are less people trying to kill you specifically. Hang back behind your teammates and tag people from afar. Forget about winning, just concentrate on your K/D ratio. If you think that taking a certain point in Control looks too dangerous, don't do it. Forget about risking a run for the heavy ammo packs too. Unless you're a Void Warlock, remember that your melee attack and grenades won't help your score. Remember; 2 void kills mean you can safely die 5 times before those points are cancelled out, so relax, take your time, and stop playing the moment you lose your nerve. If you find yourself losing points, it's time to take a break.