CET-4 and CET-6 are the English level that most college students should reach. As for CET-8, it is the level that English professionals should reach. As for your present level, you can't pass CET-6. You have to work hard for a few years. However, at your current level, I can tell you responsibly that you may not even pass the second level. So you have to work hard by yourself. If you have a goal, you must work hard to achieve it.