Re: 5th kyu question
Our sensei likes to change the test too. We have "standard" things on each test, but he always throws things in that aren't on there. More often then not, I hear it is things you should know or have already done though. I think it is just one more factor that pushes you beyond your comfort zone, which can be a great opportunity for growth. I don't know if he would fail you if you couldn't perform it well or not though. I have only tested once and I have only seen one other test done and that was two people testing for 5th kyu like I did a few months later.