At the end of each section.
Effective study. Read your own questions on the left side of the text cover the answers on the right and try to answer them. Do you use the steps above and do you have anything to add? This addition can help you to for example create links to knowledge that you already have or personal experiences Relate.
What question is this chapter trying to answer? If your professor is reviewing a lot of material from the textbook during class lectures, it is probably well worth your time to read the chapters using the SQ3R method.
What do you think the advantages of the SQ3R Method are that can contribute to the processing and understanding of written information?