As soon as you enter the test chamber pick up the turret in front of you and drop it down so it falls over. Stay away from its bullets until it closes its panels and then carefully approach the corner.
Place a portal on the wall panel to your right and then as you turn to your left, fire off the second portal behind the turret up ahead. Now quickly run into the portal so you’re picking the turret up from behind.
Set a portal on the wall where the beam hits and then carefully edge around the corner to your right. You need to - quickly - fire a portal under the turret, causing it to fall through onto its side.
Head up the nearby stairs and then you should notice two turrets behind a protective glass shield. The trick here is to place one portal directly above each of the turrets and then set the second portal under each of the two Companion Cubes to your right. They’ll land on the turrets, opening the way forward.
Pick up one of the Companion Cubes and take it around the corner with you. Now set it down and then place the second portal under the turret standing on white ground. This’ll cause it to drop into the room behind you.
Now pick the Cube back up and use it as a battering ram/shield to knock over the remaining two turrets before setting it down on the switch and opening up the exit.
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