So many times I hear from students that they memorized the unit circle, it's radian & exact values at each special angle measure, much like I did when I was in school. If we had only known.... It's so much easier to remember when you can put it together with something simple like the order of some fractions between 0 and 2 or the order of some square roots between 0 and 1.
I've used this with my own students and with students I tutor. Once they make the connections laid out in this sheet, it's not quite so difficult to remember anymore.