When determining your School of Purpose, you can take just your fingerprints or your entire handprint.
To quickly and easily take your fingerprints using a pencil, paper, and some tape, follow the instructions here.
You will want to make sure that the lines on your prints are easy to see. Remember, darker is not better. Using pens, black expo markers, or Sharpies can actually make it more difficult to see your prints and determine your School of Purpose.