Hello Saba,
I don't think there is a need to memorize anything for the PMP exam, and since the changes to the exam in 2022, the focus is on the 3 domains of people, process, and business environment rather than the 5 domains of project initiation, planning, execution, monitoring and controlling and closing. I would highly encourage you read the feedback from the students who passed the exam as there is usually a trend among students on what materials were used to prepare for the exam and how they studied for the exam. I have a post myself, and I can definitely share some of my experiences with what I read in other posts.
I would also encourage you to read the Exam Content Outline from PMI as it details exactly what will be covered on the exam. It is good to have an understanding of the ITTOs as they are still relevant, but they are not the focus of the exam and I would not spend my time practicing questions related to the ITTOs. Good luck on studying for the exam!
Regards,