1. You have the cubes set to auto-drop, so there is no need to have buttons to drop them.
2. A stepping button to drop a cube is strange and pointless. If you did not intend them to auto-drop you should have a pressing button to drop both of them.
3. The ramp that the one button raises is pointless, as it cannot be used to reach the light bridge. This makes one of the cubes superfulous.
4. The orange gel and the turret are pointless, as they are not needed to complete the test.

If you did not intend the test to be solved by portaling to the top of the light bridge and then using the light bridge to reach the exit, then you need to rethink and redesign your test.