Don't worry about part III - once you have actually taken it, you will understand why it is nothing to concern yourself with. It is not really a "test" - it is just some questions that the assessor can use to confirm that you created the submission.
As a (ridiculous) example: you might have a question such as "did you use JPGs or PNGs in your submission". If you created the submission then you will know what the real answer will be. If you didn't create the submission then you are likely to get it wrong.
The real questions are likely to be a tiny bit tougher, probably based around something you had to make an architects decision over. So a good source of ideas on what the questions might be is the document you wrote describing your design decisions.