Even students who've studied Chinese for years tend to find the Advanced HSK test quite challenging. The presence of these find-the-mistake questions are one of the major reasons why. Instead of being asked to identify a missing word from a sentence, students are instead expected to identify the portion of a longer passage that has a problem in its grammar or word usage. There is still a twenty-five percent chance of being right through random guessing, but that shouldn't be a comfort to anyone looking for certification.And don't forget that the clock is ticking. As with all of the other multiple choice questions on the HSK, you are expected to complete each question in just over 45 seconds. That gives you approximately 12 minutes to complete these 15 sample questions. Good luck!