By default, the surveys are Open for teachers to access.
You can easily Close the surveys so teachers cannot access them.
You may wish to do this before creating classes, or so you can review and adjust the data.
1. Click Surveys -> Configure survey on the dashboard.
2. Move to the "Survey Options" tab at the top of the page.
3. Click Disable Surveys and then click Save (at the far bottom of the screen).
Teachers will no longer be able to login to edit the surveys.