I just passed my Professional Scrum Master I certification test again and I would like to share with you my fresh experience. I hope that you can learn from it and pass the test or score higher. I did the PSM I once more, because I need 95% or more to apply for Professional Scrum Trainer. My scores were 91%, 93% and now 96%, so I think I can give some advice to you. No worries, you don't need to have such a high score.
"Scrum In Depth" program was renamed to "Professional Scrum Master". You can read it as war with Scrum Alliance, which provides Certified Scrum Master certificates. In my opinion. The word Professional and slogan "A Credible Standard" are used here to differencaite level of knowledge and strict rules of passing exam comparing to nearly no assesment in case of Certified Scrum Master certification. Rules of Scrum.org are quite tough and will be tougher from August 15: