For textbooks here are some ideas you might find useful
1. Photoread the entire textbook mulitple times, once a day for 2 weeks or a month is excellent.
2. during the first activation pass or 2, (of 30 minutes) work your way through the whole book. Just to become familiar with the subject as a whole.
3. After doing a general activation pass treat each chapter as a book on its own. Activate them according to need to coincide with regular classes.
4. When activating chapters it is a good practice to photoread the 2 chapters before the one you intend to activate and the 2 following (3 to 5 chapters in all). It helps you to be in the ideal photoreading state for the key chapter as well as allowing your inner mind to absorb additional data that will make comprehension easier. Since you have already photoread the whole book you can dive right into activating the book after a photoread.
5. Activate until it gels, means allow yourself to do as many 30 minute activation passes as you find necessary to have the level of comprehension that you desire.
Have fun with it too 
Alex
