Bypassing your school's firewall to read fanfiction during calculus might violate your school's Acceptable Use Policy (AUP). Consequences range from a warning to loss of internet privileges. Consider whether reading a 200k-word Reylo AU is worth detention.
If you are using a public or school computer, remember to use "Incognito" or "Private" mode. This ensures your history and login cookies are wiped once you close the window, keeping your fandom life private. For a more permanent solution, I can help you: ao3 unblocked top