when you're called to a fire things have to be done quickly or else people can suffer ,even die.
i am presuming you 're young , in your twenties. if you cant do the beep test now when you are at your best then how will you be in a job when lives are at stake?
maybe you should think again.
(sorry if i seem nasty, i dont mean to be, but your ambition should not come before the reality of life)
the fire brigade should take the best available and not a politically correct quota.