Amazon SDE 2 Onsite Interview

I have my Amazon SDE-2 onsite interview scheduled for next week.
The interview will consist of 4 rounds:

1. Coding
2. Data Structures & Algorithms (DSA)
3. Problem Solving
4. System Design

I am fairly confident about the Coding and DSA rounds.

However, I am a bit unsure about what exactly to expect in the Problem Solving round — and how it differs from standard DSA rounds. What topics should I focus on? How can I best prepare for it?

For System Design preparation, I have completed:

1. Systems Design Interview 0 to 1 playlist (by Jordan has no life)
2. System Design Questions 2.0 playlist (by Jordan has no life)

Would this be sufficient for the system design expectations at the SDE-2 level at Amazon?

Since I have about one week left, I would really appreciate any advice from those who have recently gone through the process or anyone with helpful insights!

Thanks in advance for your help!