Reading comprehension
Reading comprehension is how well you actually understand what you read, not just whether you got to the end of the page. It means you can follow the meaning, remember the main points, and explain the text in your own words.
Reading the words is the easy part. Understanding them is the part that decides your grade. You can finish a whole chapter and still have no idea what it said, which means your eyes moved but nothing stuck. Good comprehension is when you could close the book and tell a friend what it was about.
The most common mistake is reading on autopilot. You read every word, but your brain is somewhere else, so nothing lands. The fix is to keep checking yourself. After each section, stop and ask, could I explain this right now? If the answer is no, go back. Connecting new stuff to things you already know also helps it stick.
Maya is reading a biology chapter on cell respiration. Instead of just highlighting, she stops after each paragraph and tries to say the idea out loud in plain words. When she can't explain why ATP matters, she knows that's the part she has to reread.