Nothing new really. Just what you will read here on the site.
1. Do the open assessment until you get 100% every time 2. Read some of the books in the PSPO subject areas. I read Scrum: A pocket Guide and Scrum Product Ownership. I probably should have read User Stories Applied as well. 3. Read and fully understand the Scrum Guide. Almost every sentence has a deeper meaning which shows itself the more you understand the guide in entirety. 4. Understand the concept and principles of Agile 5. Google. A lot. 6. Watch videos on You Tube. 7. Participate in the forums on this site. 8. If possible, attend a course. 9. Visit the Resources page on this site
I couldn't find any test exams.
There are definitely more qualified people around here, but if you like, feel free contact me with questions or roadblocks (impediments ;-) ) that you have. Storecoza@gmail.com