Step through the portal and you’ll arrive on the suspended platform covered in orange propulsion gel. Run to the end of the platform and then turn around to face the two wall panels. Get a portal onto the middle of each one and then run through it, you’ll land on the blue gel, bouncing you over to the platform suspended in the air.
Now zoom in and look for a platform suspended up and to your left in the distance, there’s a portion of wall on the right side of it you need to place a portal on, so step through the portal behind you and you’ll arrive up on the new platform.
Now turn to your left and set an exit portal on the vertical wall where you’ve already coated the floor with orange propulsion gel. Step through the portal, run to the end of the platform, turn around and then run through the portals, this’ll give you enough speed to land on the overturned blue gel, bouncing you straight over to the exit!