• Choose Zack (the frog) in character selection in order to extend the time to make combo chains. Use his skill to be as quick as possible taking down enemies in a single row;
  
  
• Use handheld or non-lethal weapons as much as you can since you can perform quick combo chains with them or, after knocking down an enemy, perform an execution move;
  
  
• If you don´t see a clear combo opportunity, using execution moves to kill every enemy one by one grants you some extra points. Try to do this as if it was a combo chain to get even more points;
  
  
• if you have no choice but to use a firearm, use it in a different room than the one you are hiding in to prevent other enemies from locating you. Be quick and hide before they reach your shooting location.
  
  
• Knocking down enemies with a door slam adds little but some points to your final count.
  
  
• Don´t sweat it, time is important but not decisive. If you die too much, don´t worry, keep on trying until you beat the chapter because it´s surprising how often you think you've already screwed up and then you end up getting a higher rank.

• Two enemies, one behind a door and the other a little further away:
  1) knock down the first one with a door slam;
  2) throw any weapon or object to the second one;
  3) perform an execution move on the first enemy;
  4) do the same with the other.
  
  
• Two enemies patroling one after another and next to a door:
  1) knock down the first one with a door slam as he passes by the door;
  2) knock down the second one with your fists or a non-lethal weapon;
  3) perform an execution move on the first enemy;
  4) do the same with the other.
  
  
• Two enemies patroling one after another and next to a door and a third one a little further away:
  1) knock down the first one with a door slam as he passes by the door;
  2) knock down the second one with your fists or a non-lethal weapon;
  3) knock down the third one with you fists or a non-lethal weapon (or throw it);
  4) perform an execution move on the first enemy;
  5) do the same with the other two in the proper order. Be quick.
  
  
• Three enemies in a row inside a small room:
  you have three options:
  1) use a shotgun and try to take down all of them with a single shot. This can be tricky;
  2) use a non-lethal weapon to rapidly knock them down and them perform an execution move in the right order;
  3) wait until any of them is next to a door to knock him down and then go for the other two by choosing one of the previous approaches.
  
  
• Distant enemies behind windows or glass panels:
  1) if possible, try to take them down in groups, from the distance and with a firearm;
  2) be quick: shoot and hide since they can see you the same way you can see them.
  
  
• Distant enemies of any kind while you are hiding behind a door:
  1) always try to lure them to your position by opening the door and showing up in front or them for a second to instantly hide behind the door´s corner;
  2) when they reach your position, you can choose to knock them down directly by using your fists or even use the infamous door slam. You can then perform a safe execution move knowing you are out of reach behind the door.
  
  
• Heavy enemies:
  1) since you can´t knock them down, always use a firearm (shotgun has the best results);
  2) you can use them to lure other regular enemies and perform longer combo chains;
  3) be careful, the big ones with a taser can locate you even if you hide in a different room after shooting;
  4) be aware that their size turns them into a shield for the enemies behind them.
  
  
• Dogs:
  In case you haven´t noticed already, you can´t knock down dogs. Use lethal weapons (knives can be helpful) against them and try to add their kill to the combo chain.
  
  
• Bosses:
  1) they require different approaches but I still recommend using Zack to get extra combo points with the rest of non-boss enemies in the chapter.
  2) if you still struggle to get A+ with Zack in Final Chapter "Showdown", choose Jake (the cobra) to make good use of his skill and kill the katana girl at once by throwing the trophy directly at her;
  3) Chapter eleven´s van boss gets way easier if you care to carry a shotgun right before the vehicle appears.

Aaaaaaand that´s it. I tryed to make and easy and quick-to-read guide to help you getting into the A+ Club. I´m not a pro player at all but managed to make it to the end and that´s why I think the things I realized while playing could be useful for other players in the same situation.

For suggestions or any kind of comments, don´t hesitate to use the comment section and, If this guide helped you, consider leaving a thumbs-up so I know it actually works! Good luck y´all!!!