Resident Evil 6 mercenaries question

[Loki]

OMG! I'm so terrible at mercenaries my highest combo at the moment is 70!
Does anyone know the number of points you need to get B, A and S ranks?

 

[ADAxWONG]

High combos would usually get them out.

 

[Wake up Ne0]

Loki an S is 220 000 for duo . . main thing is to learn where the tougher enemies spawn so you kill them before they do much damage, and always circling your aim to check 360 degrees around you. I put some tips on the mercenaries score thread that might help to