The first rule of photoreading is know how much time you have and how you're going to spend it.
The first rule of taking a test is knowing how much time you have for each question so...
The first thing you need to do when taking multiple choice test.
Know how much time you have and how much time you can spend on each question. Subtract a bit from each to give you time in reserve.
Eg you have 1 hour for 60 questions that means you have 1 minute each, however you allow yourself 50 second per question that gives you a reserve of 10 minutes at the end to go back to tricky questions or missed ones.
If you come across an answer that you know is false cross it off immediately, it prevents you from having to re-reading and reassessing, and remembering what was wrong with it the first time round.
If after eliminating or you're stuck with plain guessing you have two options.
A fact that can be useful, is, that the answer is most often c since they don't like putting the correct answer at a or d very often. The other useful clue is that the longest answer is usually the correct one. Examiners rare spend a lot of time creating long answers for incorrect answers.
For your affirmation drop "as many". "All that is possible for me to get correct."
An idea...
You might add an affirmation. "I am alert to all the cues my mind is showing me to identify the correct answer."
When you use the memory supercharger you could try adding that affirmation, say it three times just prior to listening, if you happen to remember it while listening great and when you put the headphones away say it again 3 times, so perhaps writing it on a piece of paper will help remind you of your intention.
Let us know if this works for you.
Alex