There are three ways to play: free, subscription, and purchase of the program to run on your own server. Generally the last option would be used by schools.
FREE: As a free player you log onto the web site as a student and can do any test or any set of math problems for as long as you like for that session. You can also do this as often as you like.
SUBSCRIPTION: With a subscription everything done is saved on the Web Server and can be completed at any time from any computer. For example, if you start problems at school, you can finish them at home. There are three types of subscriptions:
Individual student subscriptions purchased on the web or over the phone by parents.