Just to put you straight, "aural" relates to the ears, ie something that is heard, "oral" relates to the mouth, ie something that is spoken. (I can hear the lewd replies starting so don't bother!)
Which is why you have an aural warning circuit breaker, these are warnings intended to be heard, not spoken.
With regards to the original post......
Learn how to use the Nav402 and the ATC600 thoroughly.
Draw a block diagram of a vhf comms t/r.
Practical aspects of how to test aerial systems.
DME/frequencies, why dme and atc transponder are linked together and remember WRT DME..63Mhz.
I'll have a chat at work and see what else they can remember.