great tool for Earth Science regents This was a great investment. Don't wait until the end of the year to purchase. The cards are organized into units/topics so they can be easily used throughout the year as test prep material. My niece has been using them since September to supplement her class notes. They are an excellent for study and test prep material as well as Regents Prep. They are written in such a way so that they target the important information which will likely be covered on the NYS Earth science regents exam.