such a horrible customer service and experience. tutor is not helpful and the question is wrong. If you missed one wrong question, you can never go to the next question. Ask help from mentor, just not helping you, just ask you to check course. Also, each reply at least 3 hours, not respond, during weekend. You sure this the right way to deal with issues? this is the worst website, and online course, I have ever been.

sinly lee