PSM 1 - Guidance

Hello All,

I am preparing for PSM-1 and have read the Scrum guide (3 times) and given the PSM Open Assessment 3-4 times scoring 90+. But I have read/heard that the actual exam is way too different and tougher as compared to the open assessment.

So any tips/guidance on what other stuff should i read and how exactly i can consider myself fully prepared before this PSM-1 exam ?

Also, do we get just one attempt for the exam ? And for the second attempt, I again need to purchase the exam ?

Thanks in Advance !!