I agree with Luke Skytod, the written standard is amazing, particularly when you think of the stress you're under during the test, particularly the financial stress, and when you have a sluggish adf which suddenly jumps 5 degrees....
MJR, the tips I picked up for the IR follow. I hope they are of some help / comfort to you:
Don't ever give up no matter what mistakes you think you have made. - All the other students I spoke to had made mistakes on the test and all said "he/she could have failed me if they had wanted to". Certainly, I thought I had "blown it" quite early on in the test but I gave it everything I could
for the rest of the flight and got a pass. If you make a mistake point out to the examiner what you have done wrong and DO SOMETHING ABOUT IT. (I'm not talking about going just outside the published limits, I'm talking about missing something like icing checks in the climb).
Remember, all humans make mistakes. What sorts out the professionals from the also-rans is how they realise they have made an error and DO SOMETHING ABOUT IT.
Always follow the least risk stategy; you won't fail if you ask for a clearance, heading or level to be repeated or reconfirmed, but you will fail if you bust an altitude because you didn't check.
I found it helped me to work out what the real "instant fails" in the test would be. That way, I seemed to have less chance of getting it wrong in the test when I had no spare brain capacity left. The sort of things I came up with were failing to set and cross-check altimeters before descent and at FAF, and turning the wrong way during the hold entry (did this twice during training!). You can make your own list. I daren't tell you how long my list was.
Finally, good luck ! Everyone is wishing you success.