Re. Preparing for PSM I assessment

Hi All,

I am new to SCRUM and would like to take the PSM I assessment. For this I have read the latest version of SCRUM guide available on this site almost 5-6 times. After completing the reading I tried attempting the Open Assessments and started with a score of Mid 80's to continuously clocking a score of 100 after 2 Attempts.

I would like to know which other material I should refer to improve my understanding about SCRUM and then appear for the actual assessment. Please advice.

Thanks & Regards
Vinay Parab, PMP.