Thanks, its good to know that I am doing the right thing. As far as questions go, I usually make fairly general questions, as I do not want to lose too many parts of the text, for example if it is a fiction book with X as the main character my question would be 'what happens to X in this book?' I know this needs improvement but I am unsure how I should make it better. Also, if I am PRing a a textbook, for example physics, and I PR a chapter, say on optics, what kind of questions should I form?Alot of very specific ones like what are the properties of concave lenses? or general like the differences between concave and convex? And finally( I am sorry for all the questions) how many activations doesnt it take for you to feel you know the material?