Yes I agree with Mr ftrplt, don't be afraid to say "I don't know", but don't say it too much, as it voids the purpose of the interview.
FFP, If you are passing the 2000ft to go marker, the length of the runway behind you is neither here nor there.
Mr McKenzie, if you can't spell Adelaide correctly, please don't pass out my prescriptions. I'd rather you become an Officer and let someone else sort out your syntax errors
As for mathematics preparation, "one in sixty's" are good to learn about, as are some figures relating to Miles per Minute when expressed in Knots. Any problems feel free to PM me.