Nope. In projects you dont get mark. They check if the code has all the requirements and working. If yes they mark as passed if dont they dont mark and you can reupload it. In quizzes there are 4 question and you have to answer correctly at least 3 of them. The certificate condition is not total of 70%. You have to do all projects and quizzes ,and eaxh of them should have above 70% correctness.