One common problem that students have with textbook reading is how long it takes to do. Often textbooks are dense with information and you will need to give your mind time to comprehend and make connections. One way to increase your reading speed is to improve your fluency. The most common factor that interferes with fluent reading is regression.
Regression is the tendency to re-read a sentence, phrase, or passage that has already been read.
Often people don't even notice when they do it. Usually, regression is a result of a lack of concentration the first time through. The best way to control regression is to notice when you do it and make a conscious effort to increase your concentration. You can use a note-card when you read to cover what you have already read as you go along. Try to look at phrases instead of individual words.