Modern school management software is very sophisticated. Extensions like Securly and GoGuardian run in the background and record browsing history. Even if you find a way to unblock a site:
If a specific page is blocked but the main site isn't: how to unblock a website on a school chromebook
The eternal quest to access blocked websites on a school Chromebook! I must emphasize that while I provide this guide, it's essential to respect your school's policies and rules regarding internet access. That being said, here are some methods to potentially unblock a website on a school Chromebook: Modern school management software is very sophisticated