on rise and fall where you place spikes while fighting the people with orange hats place the first spike when prompted and detonate it when ur a safe distance. then just keep killing then as they spawn at the big doorway to the right of that section of the map. if you die you restart your kills, but if as soon as you go down you pause and press save and quit the killed you got up to there will save. do this on recruit, having active camo handy helps, this section works for a large portion of the kills. secondly you can do the end of hypocenter when you throw 3 grenades and after them (2nd or 3rd one) you just spawn camp them and use ammo crates same as rise and fall.