If you're keen to learn PhotoReading learn on a book that is not a textbook first. Stay away from using for studies until you know how to do it.
More trigger words. No, because you preview for a maximum of 8 minutes never more for any book.
Also for textbooks treat each chapter as a book in itself. Even then you only preview the whole book once and no more than 8 minutes.
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Then when playing with text just asking one or two questions per section ( just converting headings to questions) took about 30 minutes...is it normal ?
Nope, You only need one question to get started and most people get one in less than 3 minutes if they have an appropriate purpose for the book.
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"finding the answers and noticing main points"
If that was your purpose I fail to see how that is a purpose.
Activation is done in layers.
I suggest you learn first with another non-fiction book that you are curious about and apply the 5 day test approach. Once you've done 3 or 4 you'll see what PhotoReading and activation is about and will be able to apply it to books for studying.
Alex