All registered graduate students have access to Office365. If the exam link does not automatically load the form for you than please try the following steps:
Open up any browser and go to office.com (clear your browser history & cache beforehand)
Sign in with your UofT email address
This should take you to a University of Toronto login page
Log in with your UTORID and password
You should be able to login and access all Office365 Apps --> open MS Forms
Leave MS Forms open and open another tab in the same browser
Go to the exam page and click on the exam link again
If you are still experiencing issues there may be a problem with your student account in which case you will have to contact the Information Commons Helpdesk at 416-978-4357 or help.desk@utoronto.ca