No need, don't worry, I'm in grade three, too, but we close the book. The history teacher told us that if we open a book, we just need to familiarize ourselves with the text and knowledge points (if we are not at ease, buy some labels and write the categories of knowledge points in the upper right corner of the page) and turn them out in time, but we should expand our knowledge. If you open the book, the topic will be more vivid, and you can only find 40% in the book at most.