The only thing that makes general maths papers hard are the wording. If they spelled the questions out like "Ok we are asking you to use the cos rule to find the missing side, to find the height of the tree" then everyone would get 100% (or at least, all the people that would check the formulae sheet at the back and know how to use the cos rule)
So basically this is a test of 2 things, your ability to do relatively simple to understand mathematical concepts, and TRICK YOU into reading the questions wrong. Infact I wouldnt be suprised if they all gathered around a table and laughed at number '18636464' because she fell into their CUNNING plan to make you answer in standard drinks instead of mL.
However, they are smart people. So I give credit where it is due.
P.S. I do general maths, and the exam was very easy other then the fact that I fell for a few of these traps