Similar to asking yourself questions to make connections across different ideas, you can monitor your comprehension while reading textbooks by asking yourself: Do I understand this material? If not, stop and reread it. Look up words that are not clear. Try to clarify the main points and how they relate to one another.
Another way to check comprehension is to try to recite the material aloud, either to yourself or to your study partner. Using a study group to monitor your comprehension gives you immediate feedback and is highly motivating. After you have read and marked or taken notes on key ideas from the first section of the chapter, proceed to each subsequent section until you have finished the chapter.
After you have completed each section and before you move on to the next section, ask again: What are the key ideas? What will I see on the test? At the end of each section, try to guess what information the author will present in the next section.