Other book for study?

Hi guys,

I must recognize that I have a little fear about PSM I exam, because each day I'm seeing more people writting and sharing their experiences (not passing the PSM I exam with a lot of experience, even several persons with years of experience in Scrum world).

I'm getting 100% in Open Assessments, but really I'm not sure if I'm getting the max score by knowledge or because I finished learning of memory ...

Already I saw this topic and I read all articles / videos:
https://www.scrum.org/Forums/aft/264

Note: Scum guide also was read by me in my native language and english too.

My company have an agreement with a great library / books source where I found the following book:

Software in 30 Days: How Agile Managers Beat the Odds, Delight Their Customers, and Leave Competitors In the Dust
by Ken Schwaber and Jeff Sutherland
John Wiley & Sons © 2012 (194 pages)

I think that by the year may be no will be updated at current Scrum Guide.

I don't have experience in Scrum for the same reason I'm trying to study very hard in order to get my PSM I exam and try to find future experiences here, for the same reason I'm trying to get extra resources / materials in order to prepare correctly my exam.

Really appreciate your feedback.
Regards