Cannot open a session due to having a computer at school

Two days ago we gave me a Macbook Air (OS X 10.11.5.) of my school, which means that I do not go in the name of user or password for the administrative account until I graduate and get to keep the computer. I was able to connect very well on my student account so far. I have tried everything that people say to do, but nothing seems to work. I can't really little to access the recovery mode, because everytime I try, a lock screen appears, but instead of the usual avatar that I see for my account, it is just a lock, and the background is black. It won't give me any advice for a reason, and asking for my AppleID never appears. Help?

What happens exactly if you just to the bottom of your Mac then power and turn it back on?  What connection options, if any, are you?

Tags: Notebooks

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