How do Guevarra, I would say in regards to the 25 page document learn as much as possible. Always better to have learnt too much, than not enough.
As for the maths, I can't answer your question unfortunately as I am still waiting to go for my Stage 1 also. The view I have taken on the maths, is concentrate on getting the basics as nailed on as you possibly can. As you will always use the same formula for any question.
I think for the Maths section, it's probably more a case of finding the way that works for you.
Good Luck for you Stage 1! That goes for everyone at Stage 1, 2 and especially 3
