A few days ago I passed Professional Scrum Master (PSM I) exam in scrum.org. This post pretends to be a reference path to pass the exam sucessfully based on my personal experience. In my case I had an in-company training but I think that it’s possible to pass the exam without classes following next steps:

• Read the Scrum guide carefully one or two times Link
• Take the open assessment so many times as necessary until you get 100% score Link
• Read the Scrum guide once more
• Take the course Scrum Master Certification Preparation + Mock Exam Questions (Udemy) without do the two practice sections Link
• Take the next preparation quiz so many times as neccessary until you get almost 85% Link
• Now it’s time to complete the two practice sections of Udemy course
• Take the real mode quiz Link
• Now you are ready to pass the exam. You can buy and take te exam in the next link. Link

Note: A private or in-company training is a good recomendation to obtain a deep knowledge of Scrum

Good luck!