Beep test is killer, i am also doing that once a month. If you can make it to 13+ you are doing very very well.
I did it about a month ago now, made level 8 as a baseline which isn't too bad. Aiming to get to 9 this time around. Beep test is killer, have a spew bucket handy.
PS Megs, Laps of the tennis court with a beer in your hand on the pocket bikes doesn't count as excercise!