Sounds like a lot of pressure. Definately take some time to listen to Memory Supercharger and Personal Genius every day. It might be better to wait until after the test to launch fully into PhotoReading, although there is nothing to loose (not even time) from PhotoReading the texts the test will be on. It would be a good idea to do multiple PhotoReads of it, perhaps every day.
In the PhotoReading 3rd Edition book, there is a "five day plan" for spending five days on a book. All in all, it falls somewhere short of three hours if you stick to the book's time guidelines. Definately worth doing this to your test materials.
In any case, a big part of the success in PhotoReading is letting go of the need to know the answers or information. (This is echoed in the Memory Supercharger). People have done wonderful on tests because they figured they were going to fail if they didn't PhotoRead, so they had nothing to loose. However, a short deadline can create stresses which inhibit the free flow of information through your whole mind.
Ultimately, I have faith that you are even now formulating the best way to go about achieving your goals.