Zooker, stop stealing precious bandwidth with the same stupid question in the same purple font about the cubes. It's boring, not funny, not clever and only ever people that fail the test seem to whinge about them and question their use.
It's to test spatial awareness, something which is used everyday on the sims at the college... that's why. How many times do you need to be told that? Or does your memory suffer? - A good memory is also a quality useful for ATCOs....
Rant over.
P.S. Well done to those that have recently passed stage 3! The college awaits!