I found myself in a similar situation my freshman year of college. I didn't do well my first semester. So, I got a few tutors to help me in the second semester. And I was regularly meeting with one of the Deans about what was going on.
Whenever I worked with the tutors I was fine. They were all confident that I knew the material before going into the test. Unfortunately, I wasn't. I'd start to worry about doing poorly on the test, failing the class, getting thrown out of school, etc. And that is almost exactly what happened.
I'm not sure exactly when it happened, but I came to realize that what we focus on we get. If I thought about the chance of screwing up, I did. If I thought about doing well, I did. It seems too simple and silly, but it worked. I went from getting Cs and Ds that year to virtually straight As by the time I graduated.
Anytime you catch yourself worring about doing poorly, stand or sit up straight up and take a few slow, deep breaths. And think about doing well.
I'm sure others will have different suggestions, but, here's an idea to play with for Photoreading the material. Try doing something a bit different for a little while. Try setting aside some time each day and then just do the Prepare and PhotoRead steps. Just sit down, state your purpose as something like 'I want to see how much of this material I can absorb in the next few minutes', get into that attention state with the tangerine on the back of your head, then just get into the PhotoFocus state and start flipping pages. You'll only need a few minutes of this per textbook. You could do it just before that class starts, every morning, evening, etc. Then study as you normally would have before. See what happens.
) I would recommend getting the MindMap Book by Tony Buzan. I think Tony Buzan has a book on studying also you might check that out. And like Bruce said most of it could be in the way you think. So think YOU CAN instead of YOU CAN'T. Hope that helps.