Yes, you may be able to receive help. your state may pay your Medicare premiums and, maybe other Medicare costs that you are normally responsible for such as deductibles and coinsurance .
what about medicare part plans A and B and services received?
People with Medicare Parts A and Part B can choose to receive all of their health care services through plans that are offered by private companies and approved by Medicare . If you need more info you can read Medicare's page.
and benefits are paid after they are due ? what is this about?