Hiro is such a amazing instructor. I passed my PSK I certification with 93% of pass mark. The only source i used is this course, the Scrum Guide and Kanban Guide. The way Hiro has structured the questions is very useful to pass the PSK 1 certification easily. Also Hiro is very active in answering the question with detailed answers. Really appreciate that. So I am highly recommend this course for those who willing to take the PSK I exam.