USA schools should not make a purchase here, but instead purchase a license directly at http://virtuallabs.ket.org/physics/
This product is for international users only, who are unable to use their credit card through the regular web site. You must first request a free trial at http://virtuallabs.ket.org/physics/free-trial/
This is a one-year student user license for a non-USA high school (K-12). You will need to purchase one student user license for each student.
You will also need to add one High School Site License to your cart before checking out.