PSPO I Exam

Hi just passed the PSM I exam (thank to all for the discussion/tips on here). Am thinking of the PSPO but had a few questions.

1. Is the Scrum Guide and associated reading enough to attempt this?
2. Is there alot of overlap between both?
3. There was a mention in previous post about provisioning an open assessment for the PSPO? Is there any update on this?

Thanks!