STCW assessment for upgrade

Hello everyone,

I have been using the forum as a reference for me upgrade from 100T NC to 500T Master for the past six months and everyone on here has been a huge help. I submitted all of my sea service and pre-requisite courses to the REC and received a letter back stating that I needed to complete my STCW assessment, reference II/4. Maybe I am looking in all the wrong places, but I cannot seem to find what is exactly needed to complete this and get my approval to test.

Once again I am upgrading from 100T NC to 500T NC and from OS to AB limited; just to lay everything out on the table.

Any help in this matter would be much appreciated.