How to use all the space in Word 2010?

What I mean by that is that the header, footer, and left and right borders can be typed on. I have Physics Finals tomorrow and I can use 1 page of notes. I'm using word to recreate my notes because It's a lot neater and every time I try to cram information in a small piece of paper i tend to write small then it gets bigger and bigger. Please don't tell me just write the thing, I've already tried, but typing the formulas and other information just seems easier.