I also think there is a difference between a random guess and an educated guess as because the time is not unlimited on the tests and im pretty sure that most people dont finish them, you might look at the cube questions and quickly make a decision about which one you THINK it is, rather than just leave the last 10 questions on your answer sheet blank because you didnt have lots of time to spend looking at them.
Can everyone who has passed stage 2 computer tests honestly say that they actually did ALL the maths questions in their head whilst managing NOT to crash any aircraft??? I doubt it!
If so I humbly salute you for being as clever as me
