HELP! Bought Lenovo - Need to bypass some things.

I need to bypass uefi bios password. It has a password. I have a thinkpad yoga 11e. It used to belong to a school system I believe. When I launch it comes up and it has some kids name, and other user option. Even if I had a logon it says the servers are unavailable. I try to login to default administrator but it is disabled. I need help. I can't do anything. UEFI is locked. Has user password. I can't do anything. Can't reinstall windows. Replacing hard drive came to mind but I'm looking for an inexpensive option. Help? I bought for 100.