I studied Maths at Churchill starting from 2002, so I must have taken the test in 2001-2002 (can't believe it!). But I'll try to help if I can. I don't remember much about it, but I remember it was multiple choice. It must have been one of those multiple choice papers where you lose marks if you get an answer wrong (so you can't guess the answers you don't know). There must have been around 20-30 questions. I remember the first question was choosing which equation fitted the graph on the paper (it was a 1/x type graph). I can't remember much about the other questions. I wouldn't have thought the questions I sat would be more than a few lines (so not too in-depth).
About the two interviews, I've recently realised how hopeless I am at interviews so they can't be that bad (again can't remember much about them).
Let me know if you need any more help.