1. Open the browser, enter "National Intelligent Education Platform for Primary and Secondary Schools" in the browser search box, and click Search.
2. Enter official website, the "National Smart Education Platform for Primary and Secondary Schools", and click "Course Learning" on the homepage to enter the corresponding grade page.
3. Click the "Course Teaching" column at the top of the "Course Learning" page to enter the course teaching page of the corresponding grade.
4. On the course teaching page, click the "Download" button under "Course Video" to download the course video of the corresponding grade.