Can't remove restrictions from a managed macOS account
I have a MacBook Air that was set up for me by the state college where I worked when I got it. They somehow set up my administrator account as mobile and managed, and I can't edit it or delete it at all. They set it up so that I can't edit the account, remove the restrictions, or delete the account. How did they do this? Is there some configuration file or something I can delete to regain control of my account. I no longer work at that college, and I would like to remove the college configuration. I don't have a lot of files on this account, so I could even move the files to a new account, but I wouldn't be able to delete this managed one afterwards. Any help?
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MacBook Air 13" (Early 2015)
macOS Sierra
2.2 GHz Intel Core i7
8 GB Memory
128GB Storage
MacBook Air 13", macOS 10.12