Yes - you can edit and re-run an activity after it has been completed.
- Log onto your teacher account
- Click on Reports (top of the page)
- Click View work
- Click View in the Assessment result box
- Click repeat or extend next to the activity you would like to set
- You can then edit the activity before repeating it again for your student
Extending a assessment will extend the end time of the assessments.
Repeat an assessment at the end of the year to assess the improvements in your students math.
If you are using the old teacher dashboard click on the Assessment panel on the right and select View Assessment.