Whirlibirds?? = 360s? They are not required in PSIA-C (my friend is preparing for his level 2).
Skiing bumps in the Midwest which are not icy and all chopped up is probably more challenging than skiing them well. Most resorts in the Midwest, unlike in the East have usually only one run devote to bumps. You find snowborders, beginners, intermediates, Johnny Mosely wannabees, all in the same spot. A few days ago the ruts were so ruined that I could not even fit my two skis jammed together in a particular through and I was on 70mm skis not Big Daddys!
Unless we have another few Summer days, those bumps are getting worse and worse by the hour. Maybe if the temperature raises enough, they will go away. I always think I am nasty in bumps out here, then I go out West, hire an instructor and when he asks me how I can ski bumps I always tell ..."like sh.t" and then he/she always get surprised for I can actually ski them fairly at ease.
I think that short turns are more difficult than long and medium ones since you have less time to react, so a good approach is to take them at slow speed instead of going down at Mach 5 to show WC prowess and then jam the skis, legs, and whatever you've got to loose a few mph's. Don't build up speed and you will be fine for most examiners at the L2 level.
One ski skiing is very important over here, but at Level 2 is usually done on the leg of choice and on green or moderate steep blue runs. I always thought that this is kind of funny and I will explain why. One ski skiing is undeniably useful. But, what does the fact that one skier can ski much better with one leg than the other say? That he is probably going to be kind of asymettrical in his performances showing a good side and a weak side. Shouldn't skiing be done with some kind of harmony in the body. It is like having two tempos in the same person skiing! And, will this not show when this skier teaches?
Hop turns (180 degree turns) are also in demand. They are fun, but I suggest you pretend to be an extreme skier on the verge of doing the impossible because if you try them on a green run it is kind of laughable (it were not you can fail an exam) besides sort of painful if your spine has seen a few too many Winters.
If you can afford it, my suggestion is to bring a lot of ski shapes since the examiner will probably not make a case for you if you happen to be a poor guy who can only afford one pair of skis so that you can ski out West (real skiing) or out East (sort of real skiing too) those few times a year. I still remember a poor candidate (quite good actually) who had a nightmare of a time because the poor soul had a pair of Bandit XX as his only skis. Try icy narrow bumps on those! Or try short radius turns as well.
You will see a lot of candidates in very narrow waisted skis: they are much easier to handle unless you have a bad case of knock-kneed legs. I always like to ski on wide skis not to lose the touch for skiing out West, but Midwest is not the RM division, unfortunately and like a good golfer you should have at least a few clubs in your bag.
PSIA does the best they can, I am sure, but it does not always look that way. Who is worse? A candidate who skids short turn on Bandit XX or one that skid 1 turn out of 10 on pencil waisted skis that turn if you blow against them? Surely they have to test the candidates somehow, but still two wrongs don't make one right, in my opinion at least.
In any case, I am rumbling, just unsatisfied with Winter in Midwest I assume, ice, rain, sun, more ice, ugly snow, ugly to teach, ugly to ski, all brown around our poor ski resorts, ugliness everywhere. Why can't I move to the RM or Intermountain division too?