How to cram one page full of notes for a test?

Here’s the scenario:

I am going to take a test on Saturday in which my teacher will let me use both sides of a normal sized paper for notes. I will be able to use this paper on the test.

Here’s the question:

What software or method would be best for creating the page of notes and getting as much information on it possible, making it so there is very little white space left on the page (but still making it readable?).

Printing is an option—so I can do this on the computer.