The time you have between now and the test will be better spent on your regular study techniques. The stress and tension of preparing for your test will probably make it difficult for you to devote enough time to learning to photoread and be confident enough that photoreading works for you. The time before a test is really a bad time to start 'experimenting' with something new.
I suggest you do use the memory supercharger everyday especially after your daily study session. State your purpose whenever you put the tape on I suggest something like "i intend to easily recall the information that I have learnt today, when/as I need it". If you choose to learn photoreading during this time, do approach it with the sense of relaxation and play. Play with practicing the photoreading step on your textbook and let go of any expectations of seeing certain results. Most definately do what ever you normally to enter a remain calm and relaxed.
Good luck
Alex