I recommend A Star Equivalency !!
I looked at 3 companies and originally resat my English GCSE with a different company that claimed to be cheaper. It turned out their price was “before shipping* and was actually 2 pence less with ZERO support!
It was made worse the whole postage back and forth thing was time consuming and problematic. Also help with the exams was in the form of spending even more on their products.
A Star Equivalency was by far the better option and I wish I had come here first.