For abinitio recruitment there is unlikely to be any acft performance questions although some basic speed/distance/time arithmetic may be called for. Your friend probably received an ATC information pack - he should be familiar with and understand everything there, as there may be questions probing career interest. The format of the testing has changed for this round, but generally speaking speed & accuracy are important, no wild guessing - just skip the question if it's too hard. good luck. BTW he might want to give the union a call before accepting the job in case conditions for new employees are inferior to current employees (not that that could ever happen).