Do the course in full. Start by reading the book as instructed in the front cover. Then work your way through the tapes doing each of the instructions. It takes 20 to 45 minutes (max) to listen and do the exercises on each of the tapes. By the last tape you will have experienced the full course and will be able to put it fully to use.
I am watching someone using the Photoreading System for his Econimics studies and he is having a great time with it. Pleased to be covering much more information than his old method of studies. It's unnecessary to apply limitations to what you can used the Photoreading system for. Learn it first then apply it.
Alex
