@ RobStob:
If you can do long multiplication and long division without much hassle you will be able to do just about any maths in the selection. The trick is to know when to do the long multiplication and long division (unless it's obvious). Especially when conversions come up. % are easy peasy!! Nobody should struggle with Addition & Subtraction.
The 'Getaheadforthesky' book is great for the selection process. It definately works.
Also brush up on your square roots. Although I can't remember being asked to do one in the maths tests the Capt I was with on my sim check threw a stinker at me!!!
The git!!
Not being very familiar with how to work them out I eventually came to an answer about 5 minutes later. I was only 1 away as well!
Still got through.
Best of luck!
Chilli.