My first suggestion is to not worry about your prior scores. For your studies' purposes, you got a 0.
Forget about what the score breakdown is on the NASBA notice. I would also put away your CPA exam review materials.
When I failed AUD, I went back to my audit textbook from school and poured over the major cycles–Cash/Revenue, Payables, HR/Payroll. I sketched​ out from start to finish on paper each cycle. I'd write-in the relevant controls.
Next, I studied the evidence chapters. I would understand what makes for better evidence than others. Eg what can the ext auditor do to detect/prevent XYZ? And be very comfortable with what it means to go from the source documents to the journal and vice-a-versa.
Next, I made sure I knew the difference between control activities versus $ubstantive testing.
This will form the bedrock you will need to tackle practice MCQ and understand the solutions. You needn't be an expert after this. You just want to re-familiarize yourself. A change of scenery may be what you need after recovering from failing.
Get your confidence back (it may cost you an extra week but so what?). It may also help you better understand the solution to the practice MCQ. An overlooked part of studying is review. You have to be able to understand why a choice is right and why it is wrong. In a lot of cases on AUD, you will be asked (indirectly) to evaluate choices.
…
Sorry it was long. But that's my advice.
Good luck!
.