I do this from time to time and I always get people who don't know what their doing.
It is annoying because it always gets screwed up.

This will show you how to Medic Boost quickly and efficiently.
And I have yet to see a good tutorial about it

-You will need 8 people total. (Party Chat helps out )
The first squad will then set the game for '"Squad Rush" on "Atacama Desert" w/ out Hardcore. (Any map will do but I prefer Atacama Desert)
-The first squad starts a game when everyone is ready. Players in the second squad will join session on the players in the first squad.

(This tutorial will be for Atacama Desert)

You will have to tweak it slightly if you choose a different map

Step 1:
Go to the 'A' bomb plant is inside the broken ship on the first floor (All players must be in the room together)

Step 2:
Have everyone mark the objective by pressing the back button while looking at the bomb. (This will get you an extra 10 points per heal)

Step 3:
All four players on the defending team will make a square formation against the back wall with two players standing at the back and two infront of the two behind them.

-The attacking team will do the same on the other side of the bomb plant, facing the defending team (Be sure not to fall out the opening behind you)

Step 4:

-Now shoot a bullet every 3-4 seconds through both enemies standing infront of you. You should aim for the lower body/legs.
-Every 10 seconds throw your health pack (That is the time it takes it to recharge) at your teammates feet. Make sure not to throw it too far so that everyone in your squad receives the healing. (This will net you the maximum amount of points)

This is what it should look like