Advice to pass PSM 1

To be honest my target is to pass PSPO1 certification but before this I wanted to pass PSM1 because in my mind about 70% of questions are the same in PSPO1 and in PSM1. In general my preparation took about 15 days. I've passed PSM1 and my score is 96.3 % 

I've used three types of materials: 

1 - Of course Scrum Guide. The big plus of this is that you may read this (with big attention) just for 20-25 minutes