Do some Certification Exams contain extra non-graded questions?

Some exams contain additional non-graded questions that will not impact your score. These questions change on a regular basis and we do not signify which questions they are but they will not count either towards or against your score. These non-graded questions are put in place to help thwart cheating and to test the performance of exam questions. The Black Belt Exam contains 150 questions and may also include up to an additional 15 non-graded questions. The Green Belt Exam contains 100 questions and may also include up to an additional 10 non-graded questions. The Yellow Belt Exam contains 60 questions and may also include up to an additional 6 non-graded questions. The Lean Expert Exam contains 110 questions and may also include up to an additional 11 non-graded questions. The Lean Leader Exam contains 90 questions and may also include up to an additional 9 non-graded questions. The Lean Practitioner Exam contains 50 questions and may also include up to an additional 5 non-graded questions.