I am so happy to announce that I have passed the PSM1 certification exam 2 days ago . I have read the scrum guide only available in scrum.org and have taken the open assessment test. I have taken the assessment tests many times and started scoring 100% continously. The assessment questions in Mikhail Lapshin are very helpful . My current experience in Agile Scrum helped me a lot. Some of the questions are very tricky so it is very important to have a thorough understanding of each and every line in the scrum guide.So it is better to have an experience in scrum projects before taking the test or attend some online trainings.