we cant tell from that, you may be work shy or unable to use breathing equipment, or unable to do the right training,
my sister in law was a bank clerk for 20 years before being taken on.
My partner is a managing director and is retained.
It takes all sorts, only the fire service will know if they want you.
Retained may well be cheaper for them if they only run retained stations, but its experience and you may find you like certain aspects and not others.
Its not the nicest of jobs at times, it can be quite difficult to deal with some incidents.