Confidential Google Forms
You can restrict access to who can respond to a Google Form by granting permission to specific individuals only.
Step 1 - Open your Form and go to the Share button at the top-right

Step 2 - Under General access, change the Responder view to ‘Restricted’.

Step 3 - Click the 'Publish' button in the top right, then go back to the Share menu to enter the names/email addresses of the people you want to send the form to.Â
Make sure you give them ‘Responder’ permissions.
Note: If you don’t publish the form before this, the notification emails will be held until the form is published.
This will only work if recipients have a Google account.