Commercial precision landings

I'm taking my 2nd stab at my commercial checkride in a couple days.
Last week, I got through the Oral exam fine. We first flew my
instructor's Bonanza for the complex pattern work. Didn't do too bad on
the soft-field stuff, but I sailed right past my short-field mark by
about 300 feet. We then tried a short approach. Not even the 180 deg
accuracy landing. Just make the runway. Well, after several laps of
dropping the gear abeam the numbers, I did it again & came up well
short of the runway.
Pink slip.
I've gone up with my instructor to work on both accuracy landings, but
can't seem to hit them consistently. Any advice? Any examiners care to
tell how much "fudge" factor they may allow if I'm a little short or
long? If I am, can I request another try at it?
I haven't even had the chance to demonstrate the airwork in my Cherokee
yet (which I think will go much better). I'm hoping the DE will let me
do that stuff first & save the complex for last. But, since the complex
is what I failed the first time, I don't know if we have to complete
that first.
My CFI says I fly just fine, and I'm starting to feel more comfortable
in the Bo (only 7 hours so far). I've got 160+ in the Cherokee & 450
total. I'm just psyching myself out over 2 little landings.
Ugh.