Hi Khairul, thats great! Glad you've managed to complete the course, congratulations!
You are correct, sometimes, students might have missed a couple of activities or not complete them as required , but you can always check this from the Progress bar (and progress pie) found at the top of the page.
However, if you are still unable to complete them, do get in touch with us so we can reconfirm if it's a technical issue or just a completion requirement. Thanks again!