I am not sure about the getting another chance for people in hell to be good but the answer might be in Hindism where it believes in reincarnation.
My mind is always been puzzled between Allah being the Ar Rahman then why would he want his creation to suffer in hell in their most purest form?? Will Allah not accept all in Jannah when we all are just pure soul without the body?? As we all been told that this world is our test so why do we have to get result in hereafter??