I keep asking to move quickly, focusing only on the key points and advancing to the next page, but lessons often stay in the same place and repeat what was already covered. Even though I already know most of it, I want to go fast through grammar so the pace matches my real level. Instead, the class goes slowly and keeps returning to earlier material. For example, after reaching the fifth book, the next day we go back to the second or third. Why does it always return to the beginning?