what do you need help on?

i need a walkthrough on that specific test chamber

which one?

congregation part 2: supplementary

which chamber?

the 1st and second

for the first you have to place a cube on the button near the fizzler and then portal in the room with the repulser. then have the second cube falling through both portals go through the portal not in the room with the repulser and then place a portal on the surface under the other button. for the second one. use the angled panel to put down the reflection gel to get the laser to the catcher