Say you have created a test and students have attempted it. You can log in with your account and see the test results. Now, you want to allow other users (say, other teachers in your school) to see the results too. There is a simple way to do this if you are using Google Forms.
Share the link of the Google Form with whomever you want to grant access to. Ask them to open the Timer + Proctor add-on from within the Google Form. They are now associated with the same Google Form. In fact, they will see the same test link. They will be able to edit and manage the Google Form in exactly the same way as you are doing it.