The structure of the interview various sometimes based on location of interview and available resources.e.g. in HKG they have a different battery of skill test they use.Whereas outports they seem to use test as WOMBAT.But the JKI test ,computer aptitude test , and the Ravens progressive reasoning test seems to be a common thing for both
The "make or breaker " which is the personal interview will totally depend on the experice you carry into that room.Need less to say they will push you to the limits .Its always good to know more than what you are supposed.You have to draw a line cause there is too much.
As for the Flight grading, things vary .Please refer to older post's.