Depends who you end up working for mate. Reckon on an average of £1,800 a month but it varies. It is certainly do-able, unless you have a drugs habit.(!)
As for the maths stuff, you only need it if you break the FMC. Moral of the story: bring a calculator to work.
Good luck to all going to selection and those about to depart for NZ, it's a good scheme, most of us look back on it with good memories.