What is path to go from applied scientist l4 to l5 at amazon?

And you were hired in as an l4?

Hi! I have my on-site interviews coming up for an applied scientist position at Amazon and I was wondering if someone could please shed some light on the process. Specifically if you could help me out with how many rounds/focus of each round information so that I can better prepare for the interview then I would really appreciate it as I haven't been able to find anything online. FYI I just graduated from my Master's if that helps so it's a graduate research role. (L4)