People who do not know what you think of words do not stay. People with wider vocabulary are now accepted by everyone who thinks better, grasps and comments. In short, we have to have a vocabulary to understand and understand the lesson in order to learn. We also need to improve the brain functioning. This is the way to read the book.
The teacher teaches you verbally. When you are listening to a topic you do not know, it can be difficult to understand the subject. It is very important that you have knowledge about the lesson to better understand and interpret the lesson. The only way to do this is by reading the book.