Or they may tell you that you will take a test on the book in order to receive credit for reading it. If so, use your pen as you read to place a check mark in the margin next to any names or facts that you may need to memorize after you finish the book. This allows your eyes to move faster and increases your reading speed. Some people may need to place the marker below the line because their eyes need guidance moving from the end of the line to the beginning of the next line. A pacer such as your finger or a pen point tends to drag your focal point across the line to increase speed and reduce regressing back to re-read text.
Regressions are usually emotional rather than necessary for understanding.
Of course, sometimes you truly need to re-read. Remember that you are not reading math or science. You are reading fiction and do not need the detailed precision that you do while reading those subjects. If you are a social learner, it may help if you and a parent or friend read using the same time management schedule. Then you can discuss the story and talk about your opinion of what the character did in that chapter.