If cookies are disabled in your Opera browser, authentication in the exam may fail. For example, when you enter your data, the page may refresh and ask for the same information again.
To resolve this issue:
Please click on the main menu icon in the top‑right corner of the browser, then scroll the menu down.
Click on «Open all browser settings» — a new tab with the settings list will open.
In the sidebar, select: Security → Third‑party cookies → Allow third‑party sites to save cookies.
In the same settings section, you can scroll down and configure permissions for specific sites only: Sites allowed to use cookies.
After making all the changes, restart the browser and try opening the exam again.