Hey, BevinJ
I know what it's like to be a high school student in a tough schedule. Please, don't lay your hopes on PhotoReading too quickly, especially for an exam. This is for the sake of security with the skills. If you wish to use it for that purpose, then patience is necessary 
If at all you worry about the skills while doing it, it's going to be less productive. However, it wouldn't work to try not to worry, because not worrying does not take effort. (excuse the repetitive negatives)
Definitely, use the skills(tangerine) addressed to you, but don't be afraid of messing up, or expecting too much. Expect little, like a playful child. By the way, by what means did you learn about the system? (book, learning course, forums)
About the lack of success, could it be that you're just afraid to mess up a skill that promises great results? I know I was pumped up when I found about about the system, yet having too high of hopes is a risk! The system really is easy, and feel free to use the system in a way that delivers best and suits your likings.