That's a bit different. ;p
We do the same for all of the 'Life Science' classes taught by the same teacher, but we're only allowed one side. I generally use 6pt font. There's WAY too much material to put on one sheet of paper, so I just type the multiple choice questions on our previous tests. I increase the margins and use the extra space to draw diagrams. This year it's Anatomy/Physiology. We've only had three tests this semester (as compared to the 9 we had last semester in Biochemistry), so I'm not worried! Plus, that final is on Wednesday, whereas Trigonometry (and Chemistry, but we don't get any sort of external reference) is on Tuesday.
I was just typing using the generic mathematical substitues (ie sin^2θ+cos^2θ=1; 1+tan^2θ=sec^2θ, tan(2θ)=(2tanθ)/(1-tan^2θ)), but it was extremely hard to read/understand, which is why I downloaded/used MathType.