I have a school Chromebook my school let me keep after school and I wanna make it work for personal use

I have my old school computer I tried to remove the schools enrollment thing on it but failed and I found this website from YouTube and I thought coming here could help so if anyone can help my PC is a Dell Chromebook 3100 2-in-1

Hi, if your Chromebook is enrolled there isn’t an easy way to disable that. The best way to remove enrollment is to contact your school and ask them to do it for you.

I tried to they said they couldn’t