Training providers that do marking

Hi,

I've been looking around for training providers that do marking for individual units as I am a self-studier.
So far, I've found Kaplan to be the only ones that do. However, they want me to sign-up to the individual unit and then pay the assessment fee and marking fee on top of that too.

Is this correct, and does anyone know any other training providers that offer marking for self-studying students?


Many thanks!