CTC assessments aren't that daunting tbh. it's a case (as you've probably heard a thousand times) of 'it's either you have the aptitude or you don't'.
they included hand-eye co-ordination (through use of a joystick, witht he aim of keep[ing the crosshair in the middle of the screen...hands, where you are given voice commands of different scenraios with relation to what the 'man is holding in his hands'...flying though boxes, again with the use of a joystick...identifying patterns within patters...and multi-tasking with hand-eye co-ordination and counting.
have a read of the CTC topic. all the info is on there. but you havent got anything to worry about.
not sure how much it correlates with the etihad assessments.
ad