i cannot tell you what do they ask but i can ask somebody i know who got hired by them not long ago.
I don't know where are you from or what ties you have in Malta, but,
as far as i know the most difficult is not the questions but to be called for an interview, it's not a writen rule but you must be maltese to be considered for a F/O position, and also have plenty of contacts.
I know of at least two A320 rated foreign pilots who applied and got no answer, one of them quite experienced, has flown 1000's f hours on turboprop, so for what it seems they aren't looking for experienced people even if they have a rating in the most common aircrat in their fleet.
In any case wish you good luck
When i see the guy i'll ask him about the process and will post it here.