Based on what data is Yeme making the claim that Earth is a prison?
Is there any new data out there?
Have a look at "The Death Traps" and "The Escape" mysteries projects. Also Harvey is confirming that he wants to free the people on Earth.
Regarding the question "school or prison", I recommend to listen to Aziz in the Lucifer project. He asks the higher being opposed to Lucifer how far we have come in becoming free. Aziz gets the impression of a "teacher" looking at an impatient student, giving the answer that we are at about 75% on the way, and that it's totally possible to lose the progress completely if we do not work together with the free will extraterrestrials.
Therefore the question "school or prison" is misleading. I think it's both. Earth is not a school planet, but a prison planet. The school is taking place on the galactic level. We graduate be freeing ourselves from the authoritarian mindset.
Freeing ourselves includes the understanding that the state (as a concept) is illegal in natural law if its based on aggression and coercion, which is true for every state on Earth, including the democratic ones. If you want to know more, have a look at Mark Passios "Natural Law" seminar: