Dropping my 2 cents, I am still confused at why these theory exams use question banks. Why not emulate school exams like HKDSE and just make a new exam every month or two, with standardized sessions and new questions?
Even as (I consider) an avgeek myself after checking some question banks some of the questions are just uggh stupid. I can't figure out how would knowing the density of JET-A1 makes you able to save a crippled aircraft.