Ramon is correct. You're setting yourself up for an ugly and seriously disappointing experience if you attempt to do this. Photoreading succeeds when you are relaxed and when the stakes are low. Pressure is not your friend when trying to learn this process. The story may be different once you are comfortable and successful with the process, but this is no way to put the system to the test. You might decide to Photoread the text in addition to your normal studying but don't make it your sole source of learning in this situation.