Resources for Scrum.org PSD I is very limited. As part of the preparation, one will definitely need to read the syllabus (which I did) and understand the context. Thanks to the premium exams available, it helped me prepare for my exam. Don't expect the same question to appear though, but the questions here will give you the idea how the exam will be presented and with a lot of practice, I was able to cleared this certification. I only had 2 weeks to prepare for the exam and good thing, you can retake the premium exams here - unlimited retakes! The formula is to understand the syllabus + practice exams = Pass! Thank you so much.