its not about wether you can do the DST questions or you can't. why should somone who wants to be an ATCO learn material never seen before, and allocate a fare amount of time in order to do so... to be told sorry you cannot be an ATCO because you couldn't remember how to do somthin you were taught 12 years ago?cubes and diagrams absolutely fine! as they test a completely different aptitude wether you prepare or not. these are the ones they should not tell you about.