Understanding Student Data Handling

What happens to student data if the student changes schools? Also, is student data erased at the end of the school year?

As long as the student is in the same school system on the same myON site, student data remains with the student indefinitely and is not erased at the end of the school year.  All student data moves with the student to the new grade at the end of the school year. If the student moves to a different school on the same site (within the same school system or district), the data remains with the student. It is very important that the student ID number is a district/school ID so the student's usage data moves with the student.

Can students' data be cleared so they can all begin at 0 books read, etc.?

Currently, there is no way to reset student data to all 0s. In large part, this is to allow the student's usage data in myON to follow the student from school to school and from year to year.