Hi Zoe,
We always advise people to follow the guides on the website to help give you the maximum chance of success. Be well prepared, and make notes that you think will help you. No one ever really knows how it's going to go, as assessors are different - all I can say from personal experience, and having read many pages of clients experiences is that the reports tend to be filled with incorrect information. I would try your best, then you can worry about an MR afterwards, should you need to contest where you've been placed.
Chris.
Nothing on this board constitutes legal advice - always consult a professional about specific problems