Amazon Software Development Engineer (SDE) Intern interview questions

In my opinion, the online assessment was a bit unreasonable, and the fact that it seems a function of chance which problems a certain candidate might get seems a bit off to me. Obviously, you can't have people cheating so you can't give the same problem to everyone, but I am curious as to how to make it such that people know what difficulty to expect going into the interview.

First I got invited to an OA it was just a two parts assessment The first one was a hacker rank assessment I got two questions one was easy medium the other one was hard medium Then I did the final part which is a work simulation, they give you emails and situations and you have to choose the correct choice After that, I got invited to the final interview It was a 45min interview both technical and behavioral the behavioral mainly consisted of leadership principles questions