how to prepare on self-learning basis the certification: PROFESSIONAL SCRUM™ WITH KANBAN CERTIFICATION ?

Hi Community,

could somebody please give me some advice on how to prepare on self-learning basis the certification: PROFESSIONAL SCRUM™ WITH KANBAN CERTIFICATION ?

For the Scrum Master Certification, you have the Scrum Guide, plus other documents or test-assessments on the internet, but for the PSK certification I dont know how to start to prepare it.

Thanks for any help

Carlos