My prison provides housekeeping, car maintenance, home appliance maintenance, primary computer operation and so on. ...
But to be honest, these so-called courses are almost all taught by prisoners themselves. As for exams, prisons generally try their best to take care of graduation. So, a certificate is better than water, but it's better than nothing, right?
This is also the helplessness of being a prison policeman. Fake diplomas are still flying all over the society, not to mention prisons.